The overall ecological efficiency of most organisms is between
a. 1 and 2 percent.
b. 2 and 5 percent.
c. 5 and 20 percent.
d. 10 and 50 percent.
e. 50 and 75 percent.
C
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Most nutrient absorption takes place in the (select all correct choices):
A. duodenum. B. jejunum. C. ileum. D. colon. E. appendix.
Which one of the following is not a steroid that uses a type I receptor?
A. estrogen B. glucocorticoids C. thyroid hormone D. androgens
What is the source of microtubules in animal cells?
a. cytoplasm b. ribosome c. centrosome d. endoplasmic reticulum
Cells of the outer surface of a sponge obtain
nutrients by a. absorbing food that diffuses from the central cavity. b. capturing food in their microvilli. c. absorbing food distributed by amoeboid cells. d. phagocytosing bacteria and other small food items. e. poisoning small fish that contact them.