Chromosome is to cactus as gene is to

desert

weeds

needle

its needles this awnser is right on mine.

Explanation:

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves