What do valleys on the surface of a planet or moon suggest about previous land features?

A.

the presence of human life forms

B.

the presence of water

C.

the presence of earthquakes

D.

the constant bombardment of asteroids

Which of the following carries blood away from the heart?

True or false: plant cell cytokinesis is different from animal cell cytokinesis because the contractile filaments found in plant cells are structures composed of carbohydrates and the cleavage furrow in animal cells is composed of contractile

Name the subatomic particle that participates in chemical bond formation?

What materials are filtered from the blood in the kidney

Which of the following is only found in plant cells? A nucleus B DNA C ribosomes D chloroplasts

Many children were paralyzed by polio in the 1950s. Today, polio has been reduced by 99 percent. Which statement best explains how this disease has been almost eradicated?

When looking at biodiversity threats, how do invasive species rate, wat is the higest threat to biodiversity

In which process is a zygote formed in a plant from the joining of a sperm and an egg? fertilization pollination seed dispersal vascular transport

Name and describe the five main structures of the hair root

true or false: more people live in development nations than live in developed nations