What does the development of all vertebrates require?
A) a large supply of yolk
B) an aqueous environment
C) extraembryonic membranes
D) an amnion
E) a primitive streak
Ans: B) an aqueous environment
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Some birds follow moving swarms of army ants in the tropics. As the ants march along the forest floor hunting insects and small vertebrates, birds follow and pick off any insects or small vertebrates that fly or jump out of the way of the ants
This situation is an example of what kind of species interaction between the birds and the ants? A) cooperation B) consumption C) commensalism D) parasitism E) mutualism
Sperm cells mature and are stored within human males in the _____
A) urethra B) prostate C) epididymis D) seminal vesicles E) bulbourethral gland
Tropical forests make up 6 percent of total land mass but contain an estimated ________ of all species on Earth
A) 1 percent B) 6 percent C) 50 percent D) 90 percent
Based on Berthold's methods, how do researchers today determine a tissue to be endocrine in nature? What will be an ideal response?