Which of these is true of echinoderms

a. They have heads.

b. They have radial symmetry.

c. They have shells.

d. They have smooth skin.

When constructing buildings in coastal areas, humans sometimes destroy sand dunes on the beaches. This activity A. has no effect on environmental conditions. B. is harmful because the dunes serve many important functions. C.

Which of the following is an example of an organ? bacterium mushroom stomach mitochondrion

What rule states that chemical elements are made up of atoms?

Can someone live without their reproductive system? Explain

Ron is drinking water and soda in large quantities and urinating frequently, is always hungry, and is complaining of feeling sick at times. the diagnosis is type ii diabetes, which indicates that there is most likely an abnormality with his

What did Mendel cross pollination of pea plants prove

Which type of rock is created when lava cools and hardens? A. igneous B. sedimentary C. metamorphic D. cement

Name 2 ways the diffusion of popular customs can adversely affect the environment

Once your ambulance is dispatched to an emergency, you have an obligation to respond. what is this called?

Which of the following cellular adaptations assist many unicellular organisms with locomotion? A. Mitochondria B. Chloroplasts C. Cilia D. Ribosomes