These are structures which are similar in different organisms because they evolved in a similar environment, yet do not have a common ancestor.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

what is shown in the image?

eukaryote

chloroplast

mitochondrion

submitted

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

answer increasing the intensity, duration,and frequency of exercise progressively;