Answer:
Gradually, as generations of elephants continued to selectively use and develop their trunks.
Explanation:
Jean-Baptiste Lamarck was famous French Naturalist. He was a soldier, a biologist and an academic. He gave an early theory of evolution known as the theory of Lamarckism.
It was Lamarck who first believed that elephants earlier had small trunks. But eventual when there was scarcity of food and water, the elephants stretched out its trunk to reached out for food such as trees and also water. And as a result their offspring inherited long and powerful trunk.
In his theory of Lamarckism, he believed that the species passes on its traits to the offspring which they acquired through their use in their lifetime. In this case, the elephants might have used their trunks in such a way that they became long and strong over time and they passed tis trait to their babies.
Answer: Fighting infection
Explanation:
Lymphatic system is a type of circulatory system in all vertebrates. It is a network of tissues ,blood vessels, and organs. The primary function of the lymphatic system is to control the fluid balance by collecting the fluid present in excess from the tissues and depositing them in the stream of blood. The secondary function of the lymph system is the production of lymphocytes (white blood cells) which fights against the disease causing pathogens. Hence, fights against infection.
A because it is used to treat known diseases.
