The introduction of a virus to control an invasive species is an example of a. mechanical control c. biological control b. chemical control d. all of the above

the answer is c biological control

The correct answer for the blank is -

c. Biological control.

Explanation:

Biological control (also known as biocontrol) is considered as one of the most  successful and significant way to control invasive species such as pests and weeds. This method utilise the natural enemies (which can be virus, parasitic or predatory organism, bacteria, fungi) of the invasive species to control them.

Thus, option c) is the right answer.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.