What is the ultimate source of energy of almost any terrestrial food chain or food web?

Why are adults bigger than they were as children biology

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.

As a small change in a person's dna can cause a genetic disorder