A and C are balanced while B is unbalanced.
Answer:
Selection pressures are external agents which affect an organism’s ability to survive in a given environment
Selection pressures can be negative (decreases the occurrence of a trait) or positive (increases the proportion of a trait)
Selection pressures may not remain constant, leading to changes in what constitutes a beneficial adaptation
Types of selection pressures include:
Resource availability – Presence of sufficient food, habitat (shelter / territory) and mates
Environmental conditions – Temperature, weather conditions or geographical access
Biological factors – Predators and pathogens (diseases)
Explanation:
The rising acidity of the oceans threatens coral reefs by making it harder for corals to build their skeletons. ... Corals grow their skeletons upward toward sunlight and also thicken them to reinforce them.
Ocean acidification (OA) is considered an important threat to coral reef ecosystems, because it reduces the availability of carbonate ions that reef-building corals need to produce their skeletons.
Answer:
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