Answer:

Explanation:
Mechanical advantage is given by the ratio of output force by input force.
= Output force = 
= Input force = 
So,

The mechanical advantage of the pulley's is
.
B. Gravitropism is the correct answer
Answer:
I would say the last one is not true. D) Chromosomes are first visible during Interphase.
Hope I helped. ;)
Explanation: