What organelle provides energy for the cell?

What can you say about the population of foxes if the gene of red fur changes from20%to 30%

Which of the following describes how DNA provides evidence to support that life changes over time? A) Some animals exhibit similar stages of embryonic development. B) Some animals exhibit structures that are no longer used for any purpose.

Which of the following is an example of operant conditioning? A. when a dog plays dead she gets a treat in order to encourage her to repeat the behavior B. when a cat learns to drool at the sound of a can opener C. when a dog refuses to play dead D.

Which statement best describes trends in safety in underground and surface mining in the United States?

Which phrases describe groundwater? Check all that apply. - Feeds rivers - Provides habitats - Used for irrigation - Provides drinking water - Used for hydroelectric power

Which of the four main sources of water contain salt water? contain fresh water?

What are the 4 main macromolecules and their functions?

The grid used to illustrate inheritability is called: A Mendel Square, A Darwin Square, A Lamarck Square, A Punnett Square

Which term describes the sudden blockage of a blood vessel by a foreign object?

What level of life is the ecosystem