Upwellling is when , water full of nutrients is brought to the surface.

"do a testcross with a homozygous recessive plant."

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

c. heat from the poles back down towards the equator.