Purple flowers are dominate over white flowers. a heterozygous purple flower is crossed with another heterozygous purple flower. the ratio of purple flower to white would be

3:1

because if you make a table you see that three boxes have an uppercase while only one has the lowercase letter making it 3:1

   3:1

Explanation:

According to Mendel’s law of inheritance, in a monohybrid cross, dominant allele appears phenotypically in the F1 generation and on crossing between F1 hybrids, the ratio of dominant to recessive will be 3:1. Thus in the given question when the dominant purple flower is crossed with recessive white flower, the ratio of purple flower to white would be 3:1.  

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.