The innermost layer of an embryo, which develops into the digestive system.
What will be an ideal response?
Endoderm
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A frog and a toad mate. The frog drops it's sperm onto the toad's eggs as they are being laid, no offspring develop because the sperm cannot fertilize egg. This is an example of
A. mechanical isolation. B. temporal isolation. C. habitat isolation. D. behavioral isolation. E. gametic isolation.
Which of the following processes is able to
move heat away from the body and is used by humans? a. convection b. evaporation c. conduction d. radiation e. collection
Leishmaniasis is transmitted through the bite of a(n) ________.
A. Anopheles mosquito B. sand fly C. tsetse fly D. hard-bodied tick E. reduviid "kissing" bug
The experimental design in the accompanying figure was used to examine:
a. the relationship between genetic changes and metabolic enzymes.
b. the mutation rate of Neurospora.
c. resistance of Neurospora to genetic poisons.
d. toxicity of arginine metabolites.
e. growth of Neurospora in the presence of different antibiotics.