Along with an erect structure that enables us to walk on two legs, what is a feature that distinguishes the human skeleton from most other animals?

A. exoskeleton

B. four-chamber heart

C. four limbs

D. opposable thumbs

What is the scientific name of the humming bird?

All of the following are characteristics of a developing countries except

How do barnacles disperse

In some cancer, cells reproduce uncontrollably and form masses called tumors. what processes are not taking place that allow for this to occur

What law states that traits are passed from parents to offspring independently of one another

What causes the movement of calcium and sodium ions in and out of cardiac cells?

if research is restricted. then the new discoveries made are limited. which action is most likely to increase the number of discoveries scientist can make?

Which statement about nuclear fission is false? a: nuclear fission takes place in the core of the stars b: the fuel for nuclear fission is often uranium c: nuclear fission releases large amount of energy d: nuclear fission is used to generate

Some monkey flowers (Mimulus guttatus) living near the sites of copper mines can grow in soil containing high concentrations of copper, which is toxic to most plants. Copper tolerance is a heritable trait. Select the three statements that are true.

The lowest level of environmental complexity that includes both living and nonliving factors is the A: Biome B: Community C: Ecosystem D: Biosphere