D:viruses are not killed by antibiotics.
Answer:
Embryo
Explanation:
Embryo is multicellular diploid body, under mitosis it forms zygote which is single cell. The union of sperm cell and egg cell. This divides rapidly in the days followed by fertilisation. After two week of division it forms zygote. Most of flowering plants in the tissue present in the seed. It is surrounded by the embryo and also provides nutrition in the form of starch, it also have oils and proteins in it.
The vertebrate endoskeleton is internal while an arthropod's exoskeleton is not
I believe the answer is a
They create competition with some certain niche
