An educated guess or rational explanation about a specific phenomenon

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction. this is an example of speciation.

Number and variety of living organisms includes genetic, species, and ecological types

Explain what a zygote is. use the terms egg cell, sperm cell, and fertilization in your explanation.