What is gene flow?

A. When a population splits in two

B. Two populations transferring genes

C. Selection for extreme traits

D. A mutation becoming more common

Another name for unicellular organisms that dominated Earth up to the Precambrian time is A. cyanobacteria. B. stromatolites. C. eukaryotes. D. prokaryotes.

What is the main artery that leaves the heart?

Why can eukaryotes carry out more specialized functions than prokaryotes can? A) eukaryotes have more organelles B) Prokaryotes have more organelles C) eukaryotes are bigger D) prokaryotes are bigger

Drag each unit to the correct location. Identify each unit as belonging to Sl units or US Customary units gallon mile meter pound kilogram degrees Fahrenheit Kelvin SI Unit US Customary Unit

Which of the following is true of natural selection? Group of answer choices Natural selection works on traits acquired through an organism's lifetime. Natural selection operates at the level of individuals.

Which answer is a type of muscle tissue in the human body humoral cardiac digestive pulmonary

Select all the correct answers. According to Newton's law of universal gravitation, which statements are true? As we move to higher altitudes, the force of gravity on us decreases. As we move to higher altitudes, the force of gravity on us increases.

To amplify and express a gene of interest, it must first be cut out of the chromosomal DNA and inserted into what? A) restriction enzyme B) agarose gel C) vector D) none of these

Which statement is correct about the total mass of glucose and oxygen formed during photosynthesis? It is equal to the total mass of carbon dioxide used. It is less than the total mass of carbon dioxide used.

If George is startled by a loud noise immediately after his baby sister cries, he is likely to become fearful every time she cries.