Which gas has recently increased in the mesosphere, creating a rise in water vapor which has led to the formation of high-altitude clouds that are visible at night? A. Carbon Dioxide
B. Hydrogen
C. Ozone
D. Methane

Archaebacteria use for movement. celia flagella pili cell walls

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca

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.