Thank you for posting your question here at brainly. Below are the choices. The answer is 4.
1)Cell signaling is observed in single-celled organisms that reproduce asexually through binary fission.
<span>2)The mechanisms of cell signaling are similar in organisms whose last common ancestor lived a billion years ago. </span>
<span>3)The pathways in primitive organisms, such as bacteria, are shorter than in those in advanced organisms, such as humans. </span>
<span>4)Simple forms of life that have not evolved much since the origin of life, such as prokaryotes, use cell signaling.</span>
sclera choroid, <span>also known as the choroidea or </span>choroid<span>coat, is the vascular layer of the eye, containing connective tissues, and lying between the retina and the </span>sclera<span>.</span>
The correct answer is option A.
Microevolution is the modification in the frequencies of alleles, which takes place over time within a population. This modification can be due to four distinct procedures, that is, selection (natural and artificial), mutation, genetic drift, and gene flow.
This modification takes place over a comparatively short duration in comparison to the modifications known as macroevolution that is where much larger distinctions in the population take place. Thus, the correct answer is that it is an evolution within a single population.
Active Immunity - antibodies that develop in a person's own immune system after the body is exposed to an antigen through a disease or when you get an immunization (i.e. a flu shot). This type of immunity lasts for a long time.
