The fertilized egg is totipotent, whereas the cells from the inner cell mass, called embryonic stem cells, are pluripotent. Only the embryonic stem cells can give rise to the entire organism
A. true
B. false
B
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Sea anemones are ____
a. polyp forms of cnidarians b. medusa forms of cnidarians c. spongiforms of cnidarians d. spongiforms of echinoderms e. polyp forms of echinoderms
Which of the following may help to explain why there are no populations in which newts produce so much toxin that they kill all snakes, but there are several populations where snakes are completely unaffected by the toxicity of newts?
A. a change in a single amino acid can result in resistance against the toxin B. a series of mutations are required to make newts more toxic C. snakes can learn to avoid newts D. a and b are correct
The hydrologic cycle is different from other nutrient cycles in that
A) the atmosphere is involved. B) water is not recycled, but flows one way through ecosystems. C) the biotic part of the cycle plays only a small role. D) the soil is not involved. E) the ocean is involved.
T or F: the knee has 2 degrees of freedom
What will be an ideal response?