RSunday, 18 october 2015

SCIENCE PROJECT: Identifying organisms
Make a dichotomous key to classify the following animals: frog, eagle, worm, kangaroo and shark.
rana-america-central-21.jpgAguila.jpggusanos.jpgcanguro-agachado.jpgTiburon-hambriento.jpgPelophylax (frog) Aquila chysaetos (eagle) Hermocide carunculata (worm) Macropus (kangaroo) Carcharodon carcharias (shark)
·.
1-Does it have a backbone?

Yes: Its a vertebrate.Go to number 2

·No: It isn't a vertebrate.Go to number 3.

·
2-Does it have lycra skin?

Yes: Its a Pelophylax.
·No: Go to number 3.


3-Does it have legs?

·Yes: Go to number 4

·No: Its a Hermodice carunculata.


4-Does it have wings?

·Yes: Its an Aquila chysaetos.

·No: Go to number 5


5-Does it lives on the sea?

·Yes: Its a Carcharodon carcharias

·No: Its a Macropus

BERTA

Sunday 8 November 2015


How eyelashes protect your eyes?



The functions of the eyelashes are more on protection of EYES. The eyes are delicate and fragile. They need all protection they can get. The eyelash is just one of the other structures that protect the eyes. The eyelash protects the eye from many external harmful elements. The eyelashes defend the eyes from foreign materials, small particles, excessive sunlight and sweat.

They are also sensitive. They send signals to the brain that something is getting close to your eye. Another function of the eyelashes is to serve as a warning sign of an actual disease process.

The importance of the eyelashes should never be underestimated. They serve protective functions, as well as aesthetic purposes. It is not enough for us to know how vital eyelashes can be in health of our eyes. We also should perform the necessary steps to take good care of them.




Saturday, 21 November 2015


calcium word.berta.wiki.jpeg

Calcium is a mineral that is necessary for life. In addition of building bones and keeping them healthy, calcium helps our blood clot, nerves send messages and muscles contract.
Calcium is the most abundant body, is found in some foods, added to others, available as a dietary supplement, and present in some medicines (such as antacids). Calcium is required for vascular contraction and vasodilation, muscle functions,...The remaining 99% of the body´s calcium supply is stored in bones and teeth where it supports their structure and function. We should eat a diet rich in vitamins and minerals, such as calcium, especially when growing. The amount of calcium you need every day depends on the age and on the sex;
-WOMEN-
Age 50 or younger: 1,000 mg daily
Age 51 or older: 1,200 mg daily
-MEN-
Age 70 or younger: 1,000 mg daily
Age 71 or older: 1,200 mg daily
Dairy products, such as low-fat and non-fat. Milk, yogurt and cheese are high in calcium. Certain greenvegetables and other foods contain calcium in smaller amounts. Some juices, breakfast foods, soymilk, cereals, snacks, breads and bottled water have calcium that has been added. If you drink soymilk or another liquid that is fortified with calcium. Be sure to shake the container well as calcium can settle to the bottom.
calciumskeleton.berta.wiki.science.jpegcalcium food.berta.wiki.science.jpeg


Wednesday 9th December 2015
Chickenpox trabajo Berta.mm.png


THE MAIN ECOSYSTEMS OF SPAIN

The main ecosystems in Spain are 14; Agro-ecosystems, Arid zones, Wetlands and lakes, Coastal-Marine, Coastal-Terrestrial, Insular, Rivers, Urban, Atlantic forests, Mediterranean continental forests, Scierophyllous forests, Alpine mountains, Mediterranean mountains, and Marine ecosystems.

Agro-ecosystems are the basic unit of study in agroecology, and is somewhat arbitrarily defined as a spatially and functionally coherent unit of agricultural activity. They are located in all Spain communities.

Arid zones are extremely diverse in terms of their land forms, soils, fauna, flora, water balances, and human activities. Because of this diversity, no practical definition of arid environments can be derived. They are located in Murcia, Valencia and in the Canary Islands.

Wetlands and lakes are standing water ecosystems. They are located in much places of Spain.

Coastal-Marine ecosystems are home to a host of different species ranging from planktonic organisms to large marine mammals. They are located in all the coasts of Spain.

Coastal-Terrestrial ecosystems are a subset of Earth´s aquatic ecosystems. They are located in a few places of Spain.

Insular ecosystems may be particularly vulnerable to ecological effects from climate change. They are located in many communities of Spain, except in Galicia, Cantabria and Asturias.

Urban ecosystems can be found in man-made ecosystems. They occupy only about 2% of the land surface area of the planet. They are located in over all Spain.

Atlantic forests are terrestrial biome and region which extends along the Atlantic coast of Brazil from Rio Grande do Norte.

Mediterranean forests are found surrounding areas of the Mediterranean Sea.

Scierophyllous ecosystems are forests that perform each ecosystem functions. They are located in approximately all over Spain, except on Galicia, Cantabria and Asturias.

Alpine mountains are segments of discontinuous mountains, like the Pyrenees or the Central plateau.

Marine ecosystems can be Coral reefs, Shoreline and Open oceans.





Spanish-ecosystems-map-berta-m-m-wiki.jpg



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YEAR 2016-17
REPRODUCTION ON SEAHORSES

Seahorses reproduce in an unusual way. The male seahorse become pregnant instead of the female. Most seahorses pregnancies lasts approximately 2 to 3 weeks. The male sea horse has a brood pouch where he carries the eggs deposited by the female.

Seahorses are very known because of their mating rituals in which they dance together before mating.

The mating pair entwine their tails and the female alings a long tube called the ovipositor with the males pouch. The eggs move through the tube into the males pouch where he
then fertilizes them. The embryos develop in ten days to six weeks, depending on species and water conditions. When the male gives birth he pumps his tail until the baby seahorses emerge.

The males pouch regulates salinity (dissolved salt content of a body of water) for the eggs, slowly increasing in the pouch to match the water outside as the eggs mature. Once the offspring hatch, the male releases the fry (baby seahorses) and does not provide parental care for them. Most will not consume their own offspring, however, it has been known for them to do so.

Once released, the offspring are independent of their parents. Some spend time among the ocean plankton developing before settling down.

At times, the male seahorse may try to consume some of the previously released offspring. Other species such as the Dwarf Seahorse (Hippocampus zosterae) hatch immediately and begin life in the benthos (organisms and habitats of the sea floor) .

Seahorses are generally monogamous, though several species such as the Big-Bellied Seahorse (Hippocampus abdominalis) are highly gregarious. In monogamous pairs, the male and female will greet one another with courtship displays in the morning and sometimes in the evening to reinforce their pair bond. Seahorses spend the rest of the day separate from each other hunting for food.


blue-arrow-bertamm.jpegSee a video of mating ritual and transferring eggs
seahorseanat.jpgseahorse4.jpg


Tuesday, 7th February 2017

THE DIFFERENCES BETWEEN PROKARYOTIC AND EUKARYOTIC CELLS

Prokaryotes and eukaryotes also different in terms of cell size. According to the University of Maryland, prokaryotic cells are typically about 0.2 to 2.0 micrometers in diameter, while eukaryotic cells are between 10 and 100 micrometers in diameter. Also both types of cells may have flagella, the structure of these flagella is different. Those of prokaryotic cells consist of two protein building blocks, while those of eukaryotic cells are comprised of complex arrangements of microtubules.
While prokaryotic cells don't contain membrane-bound organelles, they do contain ribosomes. However, these are smaller than the ribosomes found in eukaryotic cells. The DNA of prokaryotic cells is also circular rather than linear, as it is in eukaryotes. The two types of cells also divide in different manners: prokaryotic cells by binary fission and eukaryotic cells by mitosis. Sexual reproduction in prokaryotes involves only the transfer of DNA fragments between two cells, while sexual reproduction in eukaryotic cells occurs by the process of meiosis.
flecha-rosa-hi.png
Here, you have some videos of the differences between Prokaryotik and Eukaryotic