Which term refers to the movement of some molecules and ions out of the excretory system tubules and back into body fluids?
a. reabsorption
b. release
c. filtration
d. secretion
Ans: a. reabsorption
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Polyploidy in plants
A. is very common. B. allows for adaptation to diverse environments. C. may alter the levels of gene expression. D. allows humans to create plants with unusual flowers. E. All of these statements are true regarding polyploidy in plants.
The pomato, a cross between a potato and a tomato, was produced by
a. fragmentation. b. protoplast fusion. c. somaclonal section. d. grafting. e. apomixis.
Which factors are density-independent?
a) predation and competition b) competition and unusual weather c) parasitism and disease and natural disaster d) natural disaster and unusual weather
The invasion of the land by amphibians posed a number of challenges requiring evolutionary innovations. Which one of the following does not match a challenge with a corresponding adaptation found in amphibians?
A. Additional oxygen was needed for larger muscles, selecting for the partially divided heart and pulmonary circuit. B. The force of gravity was greater without water's buoying effect, selecting for well-muscled legs. C. Eggs dry out in a terrestrial environment, selecting for the amniotic egg. D. Gills tend to collapse out of the water, selecting for lungs and cutaneous respiration.