Please help. Will mark brainliest! Which statement is true about what is happening on the image above?
A. Nerve signals from the brain are controlling the arm.
B. nerve signals from the spinal cord are controlling the arm.
C. Receptors in the arm are controlling the spinal cord
D. Receptors in the hand are controlling the hand.

A. Nerve signals from the brain are controlling the arm.

Explanation:

Bec ause it starts at the brain and to the arm/hand!.

The division rate of the streptococcus bacteria is 15 minutes/division. After a period of 60 minutes there are 2000 bacteria. The initial number of bacteria can be found by looking at the number of times in an hour the division has taken place.

Number of divisions in a hour = Total time/Division rate =

So, using the logic that bacteria doubles in every division, we can backtrack the initial number.

4th division: 60 minutes has 2000 bacteria,

3rd division: 45 minutes has 1000 bacteria,

2nd division:30 minutes has 500 bacteria,

1st division: 15 minutes has 250 bacteria

0th division (initial phase): 0 minutes has 125 bacteria