Answer:
The correct option is <em><u>A. Over time, due to evolution by means of natural selection, resistant weeds survived, reproduced, and passed on their herbicide resistant genes. </u></em>
Explanation:
Herbicides can be described as substances which are used to kill unwanted plants such as the weeds. Nowadays, selective herbicides are produces which are effective in killing the weed species and do not harm the crop plants.
But over time, the weeds get resistant to the herbicide. As the theory of natural selection says, 'survival of the fittest', the herbicide which are resistant are better adapted to live hence, they pass their genes to the offsprings. This results in the production of more herbicide resistant weeds.
Nutrients in mouth create a favorable habitat
C. The area once had a warmer climate
Because the others are false:
A. A forest covered in snow will not result in fossilsed ferns as fossilization required vast periods of time
B. ^^
D. There isn't enough evidence provided in this question to support that prehistoric humans ate ancient ferns
False, the arrow for C is pointing to the genetic material of the virus cell. The capsid (protein shell) is A.