Answer:
option d
Explanation:This also refers to structures that are not present in an organism, but were present in its ancestors, i.e. traits that have undergone secondary loss.
Answer:
The correct answer is keystone predator.
Explanation:
In sustaining the composition of an ecological community, a keystone species plays an essential function. In the absence of keystone species, the ecosystem would fail to exist and would become drastically different. A predator is a classic illustration of a predator, which inhibits a specific herbivorous species from eradicating the dominant species of plants. In the non-existence of predators, the herbivorous prey would increase enormously and would clean the entire essential plant species, and thus, drastically change the significance of the ecosystem.
The sun. Without the sun we would be a big ball of ice in space.
<span>The guanine percent is 30. This is because the other 30% of the 60% is cytosine. Getting back to adenine, it always partners up with thymine. So it would be 20% thymine and 20% adenine, add those portions to the 60% of the other two, mentioned above and you have 100%.</span>