Marine cartilaginous fishes overcome water loss to their environments by:
a. having specialized chloride cells in their gills that prevent water loss.
b. having specialized chloride cells in their gills that continuously excrete salts.
c. storing urea in their body fluids, which causes them to be hypertonic to seawater.
d. producing very small quantities of urine.
e. drinking large quantities of freshwater
c
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The female gametophyte is the
a. flower. b. ovule. c. embryo sac. d. carpel. e. ovary
Energy transformations are not 100% efficient. Often, energy is released in the form of ________, which is in agreement with the second law of thermodynamics
Fill in the blank(s) with correct word
Nitrogen is the most abundant element in the atmosphere, and a crucial component of proteins, vitamins, and nucleic acids. However, plants and other producers cannot use nitrogen in its natural form (N2)
Nitrogen has to undergo a process called nitrogen fixation. What does this process involve? A) It is the synthesis of ammonia from nitrogen gas by certain bacteria. B) Nitrate is converted to ammonia. C) Ammonia is converted to nitrate. D) It is undertaken by denitrifying bacteria. E) Nitrogen is accumulated in dead organic matter.
The blind spot in the human retina is the location that has the collected axons of _____
A) ganglion cells B) bipolar cells C) primary visual cortex D) lateral geniculate nuclei