The mouse, elephant, and porpoise, are all placental mammals, leaving the opossum. So the answer is D. Hope this helps
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write full question please
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Explanation: carbon dioxide is pulled from the air and converted in to food by plants animals and human beings need to get ride of carbon dioxide through a process called respiration. this process also reduces global warming. please mark me the brainliest
When a phage comes in contact with a bacterial host, it attaches itself to the receptors at the outside surface of the cell. Once secured, the phage injects its DNA or RNA inside the cell through endocytosis. Once inside, the host will change according to the DNA or RNA injected.
If a scientist observes an enzyme polypeptide chain arranged in spiral turns that rise upward and are held in place by hydrogen bonds he/she is looking at a tertiary structural arrangement.
