A precipitin test is used to distinguish between animal and human blood.

a. True

b. False

How are cancer cells able to get nutrients away from your healthy cells?

The system of tubules atop the testes where sperm reach maturity is the

Which environmental changes occur faster? a. global warming b. oil spill

Each answer option below lists terms that classify cell types according to their developmental potential.

Where does subduction occur? A. along the middle of some ocean floors B. down the middle of mountain ranges C. on continents D. at deep-ocean treanches

According to piaget, at what age will most children enter the concrete operations stage of cognitive development? a. between the ages of 4 and 6 b. usually by age 2 c. by age 12 d. by age 7

When plants wilt, their soft stems and leaves begin to droop. What is going on inside the plants' cells that causes plants to droop like this?

How is evolution seen today

What was Marshall Nirenberg and Heinrich Matthaei's contribution to our current understanding of the genetic code? discovery of codons discovery and extraction of DNA creation of a model of DNA creation of Photo 51

How does pili affect the formation of bacterial colonies?