Humus which is formed by the decay of plant and animal matter is important for the formation of most, a) rounded sediments,

b) soils,

c) surface bedrock,

d) minerals

artificial selection

explanation:

this occur when man select base on their intelligent

i took a test for bio that had this question and these were the correct answers, not sure if this is any now lol

the nervous system and the muscular system work together.  

sweat reaches the surface of the skin and evaporates into the air.

muscles underneath the skin relax, causing hair on the skin to lay flat.