Answer:
A, C, D and E are correct.
Whales did evolve from hoofed land-dwelling mammal ancestor, Pakicetus.
The nostrils moved from the front to the top of head to help them breathe while most of their body is submerged in water. As whales became aquatic, they used their tail more and more and the hind limbs became useless and vestigial. The skull became elongated over time because this design helped them be more aerodynamic in water and helped them evolve echolocation.
Explanation:
B. is incorrect because whales are mammals too.
F. is incorrect because their bones became more dense to help them stay submerged.
Answer:
B) It breaks down polysaccharides such as starch.
Explanation:
Polysaccharides are long chains of monosaccharides like glucose joined together with glycosidic linkages. While plants can simply make glucose via photosynthesis, animals rely on glucose sourced from their diet. In animals, glucose is stored as glycogen; however, plant storage polysaccharides like starch are regularly broken down through digestion using enzymes.
Enzymes are proteins which catalyze chemical reactions like the breakdown of large polysaccharides. Alpha amylase, an enzyme produced in the pancreas, is also found in human saliva; it catalyzes the hydrolysis, or breakdown of starch into glucose. Amylase acts on polysaccharides bonds at random points along the chain by splitting the α 1-4 glycosidic bonds. This produces maltose, dextrin and glucose; this glucose is used in ATP synthesis via <em>respiration, ethyl alcohol fermentation and lactic fermentation</em>.
Carnivores (meat eaters): lion, wolf, polar bear. herbivores (plant eaters): cows, beaver, deer. omnivores (both meat and plant eaters): bears, humans, hedgehogs.
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Answer:</h2>
The statement that best describes cancer cells is,
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<h3> they are not regulated by contact inhibition".</h3>
Cancer is a fatal disease which includes the uncontrollable increase of cancer cells.
These cancerous cells reproduce at abnormal rates.
There are various kinds of cancer like breast cancer, ovarian cancer, skin cancer and so on.
faster
When exponential growth occurs, the rate of increase becomes faster as the population grows.
