How does bipedalism relate to sweat glands, skin color and hair density? What will be an ideal response?
When humans became bipedal and were active in the hot sun of Africa, overheating would have been a
major concern. Losing hair would be one way to protect against overheating, as would an increase in
the density of sweat glands. However, if chimpanzees are any indication, our now hairless and pinkskinned
ancestors would have been very exposed to potentially damaging sunlight. As a result,
increasingly darker melanin evolved to protect the skin from sun exposure.
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Explain how the resulting phenotypic ratios from Mendel's dihybrid cross assisted him in framing his Second Law
What will be an ideal response?
Answer the following statements true (T) or false (F)
1.The two main branches off the trachea are called bronchi. 2.Filter feeders are autotrophs. 3.Cows are ruminants that rely on fermenting bacteria to break down plant matter. 4.The stomach organ produces amylase to aid in starch digestion. 5.When a single-celled ciliate protist engulfs a food particle through its mouth-like oral groove, it is performing extracellular digestion.
Each of the following compounds is a source of electrons for anoxygenic photosynthesis except
A) S2- (sulfide). B) S2O32- (thiosulfate). C) H2O (water). D) succinate. E) All of the above are sources of electrons for anoxygenic photosynthesis.
A soldier ant dies defending the ant colony from invading termites. Which of the following terms best
describes this event? a. suprachiasmatic protection b. sociobiology c. ultimate cause d. inclusive fitness e. altruism