For diffusion to occur, which condition must be met?

A concentration gradient must exist.

A hypotonic external environment must exist.

A hypertonic external environment must exist.

Dynamic equilibrium must exist.

20. How did Darwin's hypotheses about evolution become scientific theories?

Scientist observes a pair of separate chromosomes that have genes for the same trait ranch in the same order however some of the release of the genes are different what is the scientist most likely observing?

If cyanobacteria never evolved during earth's history, how would their absence affect the composition of earth's atmosphere?

Which of the following best describes a production quota ? A. Droughts in parts of midwestern US has resulted in lower production of corn. B. Sugarcane growers want to influence the government to limit their production to raise the price. C.

What is the purpose of connective tissue?

What type of extreme weather does global warming cause?

Just as the body has different levels of organization, such as cells, tissues, organs, and organ systems, so does an ecosystem.

The electric signal for a contraction passes rapidly from one heart muscle cell to the next by way of

What is the BEST example of Newton's 1st law of motion? Group of answer choices A rocket will push off the ground with the same force as the ground pushes on the rocket.

Which nutrient provides the highest number of calories per gram? fat sugar carbohydrate protein