Life probably never would have emerged if the ancient atmosphere had been the same as the present one because this molecule interferes with the assembly of simple organic compounds:
a. nitrogen
b. oxygen
c. hydrogen
d. silica
e. carbon dioxide
b
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What is the inner coat of the seed called?
a. tegmen b. radicle c. testa d. epicotyl
Which gland produces both aldosterone and cortisol?
a. hypothalamus b. adrenal cortex c. anterior pituitary d. thyroid e. pineal
Which of the following is a difference between how a frog and chytridiomycetes obtain energy?
A. Frogs ingest their food; chytridiomycetes secrete digestive enzymes. B. Chytridiomycetes ingest their food; frogs secrete digestive enzymes. C. Frogs are heterotrophs; chytridiomycetes are phototrophs. D. Chytridiomycetes are heterotrophs; frogs are phototrophs. E. Frogs are autotrophs; chytridiomycetes are phototrophs.
A plant performing photosynthesis will produce ________ and consume
A. oxygen; carbon dioxide B. carbon dioxide; oxygen C. carbon dioxide; water D. water; carbon dioxide E. oxygen; water