The scientific definition of evolution refers to changes in a species or population over time.
Evolution is a long-term process. It may take millions of years and several generation for an evolution to occur. The cause of evolution can be genetic as well as environmental. The evolution is a result of mutation. Evolution generally gives rise to new species, that is different from its ancestral population.
Population is a group of similar type of organisms. These organisms live in the same habitat, require same resources and have same kind of habits. The most essential criteria that defines a population is that the organisms of a population can mate with each other and produce offspring.
To know more about evolution, here
brainly.com/question/13492988
#SPJ4
The answer is A "the first four steps of meiosis" because in mitosis the first stage is Prophase in which the chromsomes condense and centrioles move to opposite poles. And in Meiosis, the first stage is Prophase I in which the same thing occurs
Answer:
The follicular phase
Explanation:
In the follicular phase the level of estrogen hormone increases and the egg prepares itself for release. This phase occur between the first day of period and the ovulation. When the primary follicle matures and form secondary follicle, second meiotic division starts and lead to the formation of Graafian follicle which contains a secondary oocytes. Seconday oocytes consists of a diploid DNA and is not released until the second division is not complete.
Hard water is not considered a health hazard. However, it has been stated by the National Research Council that hard drinking water usually donates a small amount towards entire magnesium and calcium in the human dietary requirements.
They further state that in some of the cases, where dissolved magnesium and calcium are very large, water could be a prime contributor of magnesium and calcium to the diet. However, very high hardness, that is, above 300 ppm that is not usual of drinking water arising from surface water, may be related to the higher threat of kidney stones and cardiovascular diseases.
In the majority of the cases of kidney stones, the blood in the body of human being, due to some kind of inherent issues, begins to absorb more calcium from water and food that is in the real sense required. As a consequence, the extra amount of calcium gets deposited on the walls of the kidneys in the process of excretion.
