What conditions are necessary for viewing a rainbow in the sky?

Agroup of students are walking in the park, and one of them takes a picture of a pollen grain that is being blown by the wind.what caption can the student use for this picture? fahrte "littl1111111nimmt-hhhfull film# # #gene mutation in actiongene flow at workgenetic drift as it happensnatural selection in progresshii

Aprocedure done under controlled conditions to test a hypothesis is an inquiry.

The backbone of the double helix has an alternating molecules. what do you call these alternating molecule?