Cacti in the arizona desert compete to draw water through the roots because it does not rain much there. younger plants with smaller roots have a tough time competing with the larger roots of the older plants. as a result, some of the younger cacti will die. what is the limiting factor?

a: size of the roots
b: soil
c: sunlight
d: water

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Which of the following statements is a scientific claim? a. the early solar system had large amounts of water; so, the oldest objects in the solar system should also be abundant in water. b. earth is shaped like a sphere even if not all of the scientific observations related to its shape support this idea. c. the mass of the universe is much greater than current models predict; it is not possible to explain this inconsistency. d. planet earth is abundant in water, but there is no way to scientifically determine from where earth's water originated.

How are most animals classified in reference to symmetry? a. assymetry b. bilateral symmetry c. monolateral symmetry d. radial symmetry