Infants spend much more of their sleep time than adults do in which stage of sleep? a. Stage 1 b. Stage 2 c. Stage 3 d. REM

Which of the following is a region with steep undersea mountains and deep valleys? continental margin ocean basin floor ocean ridge ocean trench

What organisms makes its own food using light energy from the sun

1: Why are siblings not genetically identical even if they have the same parents? 2: Why are offspring not genetically identical to either the parent in sexuall reproduction?

The growth and changes in appearance in some organisms is called?

Select all that apply. Which of the following are methods of classical biotechnology? a. selective breeding recombinant b. DNA hybridization c. cloning d. induced mutations

What happens to Earth when it is farthest from the sun? It moves fastest. It stops rotating. It moves slowest. It stops revolving.

What are two different habitats in a prairie ecosystem and name one organism found in each habitat.

Which level on the energy pyramid has the third most energy? A. primary producers B. primary consumers C. secondary consumers D. tertiary consumers

How do pH affect the stability of double-stranded nucleic acid?

What is the first step in the scientific process