How does the muscular system help humans maintain posture? A. Muscles continually align themselves vertically to help maintain posture.
B. Muscles continually push bones to be straight.
C. Muscles constantly contract and relax to help fight gravity.
D. Muscles constantly contract and relax to help work with gravity.

Its

c

Explanation:

It's c I'm studying about it and I got the answer

post-impressionism is a predominantly french art movement that developed roughly between 1886 and 1905, from the last impressionist exhibition to the birth of fauvism. post-impressionism emerged as a reaction against impressionists' concern for the naturalistic depiction of light and colour.

explanation:

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.