Non-renewable resource
Explanation:
The cheetahs can be considered a non-renewable resource. Non-renewable implies that a resource cannot be replenished at it current rate of depletion.
How much has the cheetah's population declined:
percentage declination = 
x 100
Population in 1990 = 100,000
Population today = 12,000
Percentage declination = 
x 100 = 83.3%
We can see that the cheetah has suffered a whooping 83.3% decline in their population.
A renewable resource is one that can be replenished as it is being used such as water, air, e.t.c.
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Ichthyology is best characterised as Science. None of the other field of studies apply to Ichthyology.
Pseudoscience are beliefs or theories that have been considered scientific. However, they are disapproved scientifically because lack of facts and evidence.
Cryptozoology is study of animals that are rumoured to exist. (Bigfoot, Loch Ness Monster, etc) It is connected with pseudoscience.
Mythology can refer to myths or the study of myths.
As you can see, the study of fish does not apply to any of the area of studies except for Science. Ichthyology applies to Science, because it is a scientific study is different aspects of various species of fish. This includes history, behaviour, and growth.
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Answer:
A. The molecule to which a drug binds
Explanation:
D - Allow pH to change drastically.
The reason that we have buffer in our system is to protect AGAINST sudden change of pH
