For the first question, I would say a line graph. And the one about the human heart, I need some more information.
Plants roots display positive gravitropism which means they grow in the direction of gravity
C.Xylem
Xylem is where the nutrients and water gets transported upward
The answer is Habitat. The brackish water environment is formed due to the mixing of fresh water from the river with the salty waters of the ocean. This habitat is significant for fishes that come to spawn and feed. Crabs, mosquitoes and birds can also be found in this environment.
