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.

d

explanation:

the higher the instrument the better

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.