In the food chain grass ? antelope ? human ? lion, the human is a ________
A) tertiary consumer
B) secondary consumer
C) primary consumer
D) producer
B
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Were there any eukaryotic cells on Earth 1.5 billion years ago?
A. No, they do not appear in the fossil record until around 1 million years ago. B. Yes, they first appear in the fossil record around 1.8 billion years ago. C. No, they do not appear in the fossil record until around 500 million years ago. D. Yes, they first appear in the fossil record around 3.5 billion years ago.
Marine mammals use ____ to extend dive times
a. decreased blood volume b. increased erythrocyte count c. increased in lung volume d. reduced concentrations of muscle myoglobin e. elevated circulation to nonessential organs
The walls of the descending limb of the loop of Henle are relatively permeable to sodium
____________________ Indicate whether the statement is true or false.
Which reactant of aerobic respiration is oxidized?
a. water b. oxygen c. glucose d. energy e. carbon dioxide