Answer:
True.
Explanation:
Vitamin D is a fat soluble vitamin that is responsible for fostering the absorption of calcium, magnesium and phosphate in the body.
The synthesis of calciferol is dependent on the availability of a related steroid called cholecalciferol (vitamin D3), which may be synthesized in the skin or absorbed from the diet because keratinocytes of the epidermis and fibroblasts of the skin is response for producing vitamin D3(calciferol) by absorbing it from ultraviolet light when during exposure to UV B photons which protolyses provitamin D3 to pre vitamin D3 in the human body.
It can also be gotten from food sources like milk, cheese, cereals, liver,meat e.t.c.
The first step of the water cycle is evaporation. It is the process where the water at the surface turns into something we call water vapor. The second step is condensation. This is the process when the water vapor turns into ice/water droplets. The third step is sublimation. It is the process of when the ice directly converts into water vapor with out turning into liquid water. The forth step is precipitation. This is when the clouds pour down due to temperature or wind change. The fifth step is <span>transpiration. When the water sinks into the roots of the plant, the transpiration process is similar by when liquid water is turned into water vapor the the plant. The sixth step is runoff. This is when water runs over the surface of the earth. The final process is infiltration. This is if some of the water does not runoff into rivers, the water seeps into the ground and increases the level of ground water table.</span>
Gene flow is also called gene migration. Gene flow is the transfer of genetic material from one population to another. Gene flow can take place between two populations of the same species through migration, and is mediated by reproduction and vertical gene transfer from parent to offspring.
<span>a. The gamete will undergo many changes after the egg is fertilized.</span>
Answers;
Initiation of transcription;
Proteins called transcription factors are involved in the initiation stage of transcription
Explanation;
Transcription factors are proteins that help turn specific genes "on" or "off" by binding to nearby DNA.
Transcription factors that are activators boost a gene's transcription while the repressors decrease transcription.
These factors allow cells to perform logic operations and combine different sources of information to "decide" whether to express a gene
