Answer:
The correct answer is C) gene flow
Explanation:
The biological species concept defines what is a species. It says that a species is a group of individuals in a population that interbreed with each other. So there should be gene flow between the members of the population to come under species.
Appearance does not define that two individual are of same species because even different species can look same for example Western meadowlarks and eastern meadowlarks looks identical to each other but they do not interbreed so there is no gene flow between them so they are not same species.
Therefore the primary criteria for determining species boundaries is gene flow.
Answer and Explanation:
Density-dependent factors include competition, predation, parasitism and disease. When organisms are densely populated, they can easily transmit parasites and diseases to one another through contact with skin and body fluids. Disease is spread quickly through densely packed populations due to how close organisms are to one another. All these factors can affect the volume of a population. Predation affects population because the predators feeds on the prey by killing it.
Answer:
The independent variable of Galileo Galilei experiment is
1) the speed of the ball
Explanation:
Galileo Galilei (1564- 1642) was one of the foremost scientist to carefully consider what was going on.
One of the key ideas is that everything depends on time (t) so it plays the role usually assigned to ' x ' in the Cartesian setup and is recorded horizontally .
Galileo experiment proves that objects fell with the same acceleration