Question:What is one difference between the theory of continental drift and the one theory of plate tectonics
Answer/Explanation: Continental drift is the hypothesis that states that the continents once formed a single landmass(Pangaea) broke up and drifted to their present locations.Sea-floor spreading the process by which new oceanic lithosphere(sea floor) forms as magma rises to Earth's surface and solidifies at a mid-ocean ridge.
In the block to polyspermy, entry of the sperm's contents causes calcium ion levels in the oocyte's cytoplasm to rise, triggering the cortical reaction.
In biology, polyspermy describes the fertilization of an egg by more than one sperm. Diploid organisms normally contain two copies of each chromosome, one from each parent.
The cell resulting from polyspermy, on the other hand, contains three or more copies of each chromosome—one from the egg and one each from multiple sperm. Usually, the result is an unviable zygote. This may occur because sperm are too efficient at reaching and fertilizing eggs due to the selective pressures of sperm competition.
The cortical reaction is a calcium-dependent exocytotic process in which the content of secretory granules is released into the perivitellin space immediately after fertilization, which serves to prevent polyspermic fertilization.
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I think it is a sex cell (not sure)
Answer:c)
troposphere
Explanation:
Bz it is closest to plant
Senescence-like phenotype is normally regarded as a suppressive manner, both by preventing cancer cellular proliferation and suppressing malignant development from pre-malignant to malignant disorder.
Senescence is generally regarded as a tumour suppressive method, both with the aid of preventing cancer cell proliferation and suppressing malignant progression from pre-malignant to malignant disease. Cell senescence limits the replicative potential of cells, as a consequence stopping the proliferation of cells which are at distinct stages of malignancy.
A recent frame of evidence shows that induction of senescence can be exploited as a foundation for most cancers therapy. Senescence is a double-edged sword which could function in contrary directions. It far a capacity mechanism for a cell to avoid malignant transformation. however, senescence can also sell most cancers improvement with the aid of changing the cellular microenvironment thru a senescence-related secretory phenotype.
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