This is because of B. Their cells are in direct contact with the environment.
Answer:
It is the cycle when the reproductive organs start to fertilize. Another form of this is called the menstural cycle when natural changes in the uterus and ovaries to make reproduction possible soon.
Under a microscope, gram-positive bacteria (when dyed with the gram stain) appear in purple-colored structures due to the peptidoglycan cell wall.
<h3>What are gram-positive bacteria?</h3>
Gram-positive bacteria are microorganisms (bacteria) that may be colored with crystal violet stain due to the presence of a peptidoglycan-based cell wall.
In conclusion, under a microscope, gram-positive bacteria (when dyed with the gram stain) appear purple-colored structures due to the peptidoglycan cell wall.
Learn more about gram-positive bacteria here:
brainly.com/question/14543191
#SPJ1
The answer is: an "instinct" .
______________________________________________
