The correct options are as follows:
1. C
The open ocean does not begin at the low tide mark and extend to the continental shelf, the oceanic zone typically begins in the offshore area where the water measures about 200 meters deep or deeper and it extends to the ocean floor.
2. B.
The inter tidal zone in the marine aquatic environment refers to the areas of the foreshore and the seabeds which is exposed to the air at low tide and submerged at high tide. One of the features of the inter tidal zone is that it is exposed to extreme temperatures, from very hot to near freezing point.<span />
If you use visual pyrotechnic distress signals, 6 pairs of unexpired vdss must be taken on board your vessel.
<h3>How many visual pyrotechnic distress signals to carry on the vessels?</h3>
In coastal areas, up to 20 miles from the coast, the mandatory set of six flares must consist of two red star manual flares, two red star rockets with parachutes and two floating orange smoke (smoke) flares.
With this information, we can conclude that If you use visual pyrotechnic distress signals, 6 pairs of unexpired vdss must be taken on board your vessel.
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Answer:
D) secrete a cytokine that triggers apoptosis
Explanation:
Cytotoxic T cells also known as killer cells are lymphocytes that can kill foreign cells (also cancer cells, damaged and infected cells). They express specific type of receptors called T-cell receptors (TCRs) which recognize antigen of foreign cells. Cytotoxic T cells release cytotoxins such as perforin and granzymes and their role is to trigger the signal cascade in the target cell that will lead to apopotsis.