According to "life without gravity," why can astronauts' muscles become weak?
a. without gravity, the blood is rerouted from the legs to the head.
b. without gravity, the body "grows" by as much as several inches.
c. without gravity, eating is difficult, so the body does not get proper nutrition.
d. without gravity, the muscles do not need to do as much work.

The correct answer is A

Explanation:

This because in space there is microgravity I.e absence or less gravity, the astronaut do not need to do much work, just to sleep, eat and go around. In microgravity the muscles are prone to atropy( respons e to gravity) which causes the muscle to be stiffen and straighten out, the muscles becomes weak.

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

i think its through the fallopian tube