A limiting factor is something that restricts organism(s) from increasing their population. If you look at a graph showing the population of a certain organism, you will notice that at a certain amount of their population it stays around the same area. That is known as the <em>carrying capacity</em>. The carrying capacity is there due to the limiting factors, which depends based on the needs of particular organisms. For example, one limiting factor for a certain species might be that the number of predators increased, or there are limited resources available in order to survive.
The only possibility of the daughter being colour blind is where both parents have a recessive gene for colour blindness with the father being colour blind as well. so assuming the recessive allele is Xc, then the genotype of the mother is XCXc, where she has a normal colour vision and the father's genotype is XcY, where he is colour blind.
Another name for unicellular organisms that dominated Earth up to the Precambrian time is prokaryotes. The correct answer is D.
Answer: Sinusoid capillaries
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