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.
The right answer is inversion.
Inversion is a genetic mutation characterized by the end-to-end reversal of a portion of chromatid on a chromosome.
In other words, it is a double break then it is replaced after rotation of 180 ° of a chromosome segment (backward insertion).
We distinguish :
Paracentric inversions: The centromere in the chromosome is not included in the inversion.
Pericentric inversions: The centromere is included in the inversion which transforms a metacentric chromosome into an acrocentric chromosome.
<span>Magnetic resonance imaging
is a technology that uses magnetic fields and radio waves to produce high
quality 2 or 3 dimensional images of the brain structure without using
radioactive tracers and ionizing radiation. The magnetic resonance intensity is
proportional to the density of the protons in various tissues.</span>
ANSWER:
After the volcanic eruption,lava cools down,vegetation reappears and microscopic plants grow,then the macroscopic plants and animals come at that place,then gradually the whole system builds and ecosystem recovers.
EXPLANATION:
Biodiversity means diverse population of plants and animals. After the volcanic eruption,both plants and animals donot exist because of high temperature and not suitable environment. With the passage of the time, the lava cools down and vegetation stars reappearing. First of all lichens and microscopic plants and after that macroscopic plants and animals come at that place.Thus suitable conditions reappear and gradually the whole ecosystem recovers.
