Fish lay a large number of eggs, few of which are fertilized and very few of which hatch into young ones. Still fewer live to ma
turity and very few of these are fertile. Which principles of evolution are represented in this example? A. Descent with modification and evolution
B. Struggle for existence and survival of the fittest
C. Adaptation and artificial selection
Option B, Struggle for existence and survival of the fittest
Explanation:
According to the Darwin’s theory of natural selection species which adapts themselves to the changing environmental condition in order to become efficient enough to survive and reproduce are termed as the “fittest” and thus he further stated that it is the “fittest” species which is able to survive.
Option B also outlines the same concept and thus it is correct choice.
Root hair cells are alive and therefore need energy, which is why root hair cells contain many mitochondria in them. Root hair cells don't contain chloroplasts. Chloroplasts are used by the plant to make food using light energy. Since the roots aren't exposed to any form of light, they have no need for chloroplasts.
