When Charles Darwin arrived in South America what observation did he make regarding rabbits?

South American Grasslands

Explanation:

When Charles Darwin arrived in South America he noticed that many species including rabbits were missing from the South American Grasslands. Instead he found flightless, ground-dwelling birds called rheas in these grasslands. These animals were not like rabbits but instead shared many similarities to ostriches, and only lived in South America, where ostriches lived only in Africa.

it would affect precipitation by causing flooding in some areas of the world due to climate increasing, causing the glaciers in the northern and southern pole of our planet to melt.

i wish you would have provided choices to simplify it and allow me to give an exact answer.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.