When throwing a ball, why does the triceps muscle contract? •The contraction of the triceps muscle causes the arm to flex

•The contraction of the triceps muscle causes the arm to extend

•When added to the force of the biceps contracting it provides extra force to the ball.

•The triceps muscle needs to contract in order to keep the biceps muscle from relaxing ,

I think it might be A, it seems the most reasonable.

Explanation:

the reason why I say that is because

B, contraction is more tense and it is shortened meaning it wouldn't be able to relax so it wouldn't extend.

C, it doesn't really give you a explanation of why the tricep muscle contracts.

D, triceps are made to relax, which means it is the opposite of contraction because the tricep needs to relax in order for the bicep to contract.

Sorry if I'm wrong :/

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.