Answer;
Genetic drift
The mechanism of evolution that would have caused this change is genetic drift.
Explanation;
Genetic drift refers to changes in allele frequencies due to random chance. Genetic drift will eventually lead to allele loss or fixation even in large populations, but will take many more generations to occur in large populations than small. It may rapidly alter allele frequencies when population size decreases; bottle neck effect and founder effect.
The answer is Antennae, ocelli,
and mandibles. Antennae are used by arthropods to sense their environment. Ocelli
also referred to as eye spots, detect light and
the mandibles are used to cut food or used as weapons in some arthropods. Antennae and mandibles are paired
appendages while ocelli are three in some arthropods
such as bees.
When the food you have eaten reaches the stomach, the hormone released is what we call Gastrin. The ‘G’ cells produce these hormones. These hormones are produced in the lining of the stomach and upper small intestine. When a person is having a meal, it is the gastrin which stimulates the stomach to release gastric acid. Aside from the proteins from the food that are broken down, the gastrin makes it possible for the vitamins to be absorbed by the stomach. Gastrin also serves as a disinfectant and kills most of the bacteria that enter the stomach with food, minimising the risk of infection within the gut. It also stimulates the stomach lining’s growth as well as it also increases muscle contractions of the gut to aid digestion. On the other hand, the gastrointestinal hormones or the gut hormones constitute a group of hormones secreted by enteroendocrine cells in the stomach, pancreas, and small intestine that control various functions of the digestive organs.
It’s due to stem cells. The genes in dna turn on and off to give a cell a specific job, so stem cells can be “programmed” as any cell the body needs. (Muscle cell, skin cell, etc)
The first statement is absolutely correct !!
in a neutral atom, no of protons are always equal to no of electrons !!