<span>atom ---> molecule ----> macromolecule ---</span>> organelle---> cell--> tissue---> organ/ organ system --> organism .
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The answer is D
A is cell division, B is some stage of pregnancy, and C is DNA replication.
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Roots apparently don't need gravity to place their directional skewing. They will grow away from a light source but of gravitational forces. Although plants on Earth do use gravity to help determine their direction of growth, it is clear that gravity is neither essential for root positioning nor the only factor controlling root growth patterns. In order to get water and other essential nutrients, the roots of plants grow in all directions if there's no gravity.
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sound waves. they come in longitudinal waves and vibrations. echo is wrong though youre right on that one