Which of the following is an example of chemical weathering? plant roots pushing through a hole in a rock and cracking it. ice freezing in the crack of a rock and splitting it apart. carbonic acid wearing away the minerals in a rock. wind rubbing sand against a rock and wearing it down.

Describe two recent or ongoing space missions.

In order to study genetic mutations, scientists must study genetic material. which statement describes the genetic material scientists are most likely studying? a) they study alleles that contain chromosomes, which are rna.b) they study alleles that contain genes, which are chromosomes.c) they study chromosomes that contain genes, which are dna segments.

Which part of the spine is likely to cause a nerve signal to travel faster? a. backbones b. white matter c. nuclei d. gray matter