Which factor was most responsible for the production of oxygen by the elodea? a the presence of light stimulated photosynthesis. b the plant contained a large number of mitochondria.

Within a flock of birds, some birds have long narrow beaks, and other birds have short wide beaks. Environmental changes happen that make it harder for birds that have short wide beaks to find food.

Which statement best describes the role of respiration

Substitution is a replacement in which a base pair is replaced by a new base pair. True False

Can a light pass through a black paper?

Which statement explains blood pressure? A. Blood pressure is highest in the veins near the heart. B. Blood pressure is highest in the arteries near the heart. C. Blood pressure is highest in the veins farthest away from the heart. D.

The cerebellum can be permanently damaged by stroke or temporarily affected by drugs or alcohol. The resulting disturbance in motor control is known as:

A narrow strip of land connecting two larger land bodies is known as a (n: a. peninsula b. bridgeland c. spine d. archipelago e. isthmus

What are fat soluble signalmolecules that are derived from cholesterol?

A wealthy businessman uses modern DNA technology to bring dinosaurs back from extinction. He breeds many varieties of dinosaurs and plans to open a theme park where visitors can see them.

If a DNA sample contains 25 percent adenine (A), what percent of thymine, cytosine, and guanine must it contain? Use Chargaff's rule to construct your answer