Whats the difference between an exoskeleton and an endoskeleton?

An exoskeleton is a hard external skeleton that protects the outer surface of an organism; whereas, an endoskeleton is an internal skeleton composed of hard, mineralized tissue.

Explanation:

an exoskeleton is found in invertebrates while and endoskeleton is found in vertebrates.

Explanation:

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.