D. Cholinergic antagonists
Photosynthesis is the process where plants turn the sun's energy into food for the plant. It is like the human's process of cellular respiration.
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I believe a woman can be described pregnant after about 13 weeks or so, because this is when the unpleasant effects of pregnancy start to lessen, and the mother starts to get used to the hormonal changes.
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If an index fossil whose absolute age is used as a reference for other fossils, it was determined only by radioactive dating or another absolute method.
Chloroplast is a cell organelle and the site of photosynthesis in eukaryotic cells. Hence they are present in plant cells and algae, but not in animal cells or bacteria cells.
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