The diagram shows blood flow through organs in the human body. Describe how cells, tissues, organs, and organ systems are dependent upon one another.

When does dna replication(make a copy of itself)?

Describe how a student should adjust the microscope to see the cells on a slide more clearly?

Adrought killed all the plants in an agricultural farmland. gradually, due to wind and some birds for. nearby areas, new plants started sprouting l. what stage of succession was taking place in the farmland? a) competition b) nudation c) ecesis d) reaction e) migration