Answer: crossing over
during the process of fertilization, a sperm and egg join together to create a zygote. since a sperm had half the number of chromosomes and an egg has half the number of chromosomes, when they join together the zygote had a complete diploid set of chromosomes. the assortment of chromosomes and crossing over promotes genetic variation during the process of reproduction
When cells come together they form tissues
Answer:
The total number of people in a specific area.
Answer:
Option-E
Explanation:
Systematics is an interdisciplinary of the taxonomy, which deals with the systematic classification of organism present on Earth.
The systematic classify the organism on the basis of their traits which can help them in showing the relationship in terms of evolutionary history and in present time.
The systematics is the advanced field of taxonomy as once the systematics started with the morphological characteristics but now along with morphology the molecular, biochemical and behavioural traits are utilised.
Thus, Option-E is correct.