The correct answer is natural selection because Natural selection is an evolutionary process which was discussed by Charles Darwin in 1859, In one of his theory that it is the ability of organisms to develop traits or characteristics that will help them to adapt and ensure their survival in their environment and then passing or transferring these new traits to new species or offsprings over generations through reproduction.
Mutations are permanent transmissible changes that occur in an individual’s genetic code. Some of these changes can cause destructive conditions such as sickle cell disease or Down syndrome, while many may not be harmful, and even irrelevant. Sometimes, a mutation that will provide an individual with a benefit may take place. This type of mutation is said to be beneficial. An example is the trichomatic vision of humans which gives humans the ability to perceive, and distinguish between red, green, and blue colors.
Answer: The action cytoskeleton structure is dynamic.
Explanation: Actin cytoskeleton is a dynamic structure necessary for cell and tissue organization, including the maintenance of epithelial barriers. The epithelial barriers are necessary to maintain barriers, the disruption of the epithelial barrier coincides with alterations of the actin cytoskeleton in several disease states. Primarily these disruptions affect the paracellular space, that is normally regulated by tight junctions. The actin cytoskeleton is a usual target of bacterial virulence factors. Bacteria secrete and inject toxins and effectors to hijack the host cell machinery, in order to manipulate the action cytoskeleton, which interferes with host-cell pathways and with a number of actin binding proteins.
A milk teeth is the temporary teeth that appears from a baby stage while a permanent teeth is one that appears after the milk teeth has been removed and if this teeth is removed it cannot be replaced. Hope this helps...
