Free points only for boys i will add a nother one just for girls

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems

How many autosomes are in this human karyotype? how many sex chromosomes?