When a population of any species decreases, it leads to a decrease in populations of species that feed on them, as there is less food available and they may die of starvation or competing against each other for food. Crabs are eaten by big marine animals, such as otters and terrapins. Algae and snails does not feed on crabs. Therefore, the correct answer are the options B. Otter and D. Terrapin.
The building blocks of matter is atoms.
Alleles or genes m8. Could also go with traits maybe but that’s not as specific
<span>In order for this gene to be useful in differentiating different salmon breeds, the specific coi gene sequences must be either found or absent in all individuals of a breed, be about the same among individual breeds unless a mutation is found in an individual, and different from the coi gene sequences of other breeds. If the coi gene is found to be the same between two or more salmon breeds, then another gene will be necessary in order to differentiate between breeds.</span>
