Birds have scaly feet and lay amniotic eggs. This supports the idea that:
a. reptiles evolved from amphibians.
b. birds are the only creatures to ever have feathers.
c. birds are endothermic.
d. birds evolved from reptiles.
e. None of the above.
Ans: d. birds evolved from reptiles.
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Indicate whether this statement is TRUE or FALSE.
Which tissue acts to transport nutrients and wastes throughout the body?
a. blood b. adipose tissue c. loose connective tissue d. fibrous connective tissue e. cartilage
In a forest, trees that grow taller receive more sunlight and end up producing more viable seeds. Shorter trees of the same species receive less sunlight and produce few viable seeds. Over time, what type of selection will take place?
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What are on the surface of most vertebrate cells, acting as markers of "self"?
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