Why would a farmer use contour plowing on hills

If many different species live in an ecosystem, this the ecosystem to fill its a. populations b. niches c. producers d. communities

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.

What was darwins theory of common decent