What processes make up the general life cycle of spermatophytes?

What is called the "building block" of life?

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

When analyzing tree rings, what do scientists assume a thin ring indicates?