This could be the different times you did the experiment
Answer: Cytotoxic T cells
Explanation:
A Cytotoxic T cell is a cell whose activation is mainly aimed at destroying cells that are infected by virus. It is a type of white blood cells that destroys cancerous cells or cells that are impaired especially by viruses. A Cytotoxic cell is also known as T-killer cells, Cytolytic T cells, T lymphocyte.
Cytotoxic T cells destroy target cells by prearranged apoptoses.
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Bacteria and some other prokaryotes consists of restriction enzymes which are able to recognize specific sequences of DNA, called restriction sites. All restriction enzymes are able to recognize at least one or a few restriction sites. On identifying the target sequence, a restriction enzyme makes a double-stranded cut in the DNA molecule. This cut is a clear pattern which is easily identified as it is at or near the restriction site. A DNA fragment with complementary base fragments join with the DNA at the cut portion which is some times referred to as sticky ends
C. Wind erosion is caused by the wind blowing loose particles of dirt and/or sand from bare and flat lands. Plant structure above ground (leaves and stem) act to shield the wind and plant roots act as anchors to hold down the soil to reduce the effects of wind erosion.
