Any substance that has enhanced reactivity, or altered properties in the presence of light is said to be photoreactive. For example, a photovoltaic cell enables sunlight to be processed into usable electricity by exciting outer shell electrons on some metals. Photoreactive substances can either be natural, such as chlorophyll, or entirely man-made in the case of a photovoltaic cell.
When that situation happens then it can stimulate a cytotoxic T cell. This types of cells are the ones directly responsible for cellular immunity. Cytotoxic T cells can attack target cells by secreting a cytokine that triggers apoptosis which is <span>the death of cells which occurs as a normal and controlled part of an organism's growth or development.</span>
Parents can pass on chromosomes to their children that are different than their own when the new gene combinations are created by d) crossing over of homologous chromosomes during meiosos
Bacteria is a unicellular organism which can multiply very fast by binary cell division.
To get a number of divisions required for cell division: you can use the formula: 2

= number of bacteria
To get 256 bacteria:
2

= 256 (you can solve this equation by a calculator)
so:
n = 8 generations
With this formula the first bacteria is taken into consideration since 1 bacteria gives two, then the two give four, then eight, 16...
Answer:
B. CO2
Explanation:
Photosynthesis is the process by which plants and algae use energy from the sun to synthesize <em>C02</em>
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