How are populations, communities, and ecosystems related?

Which individual below would be considered heterozygous? a.dd b.dd c.dd

What is the next step in muscle contraction after the actin changes shape

How have crops been modified? a.plants have been made more susceptible to pests b.plants have been made resistant to herbicides c.plants have been made more susceptible to herbicides d.plants have been modified to have reduced yield