Dr. Sheffield discovers burrows in a sedimentary rock bed. Which of the following is the most likely conclusion? Dinosaurs once lived in the area. The area was once a forest. The area was once a lake. Worms once lived in the area.

What are the main characteristics of amphibians?

Stars are objects in space that produce their own heat and light. Where would the greatest number of stars be found? A. in a galaxy B. in a solar system C. in an asteroid belt D. in a meteor shower

When would the cells of a larger organism, like a human, perform anaerobic respiration? •when there is not enough carbon dioxide available to cells •when there is enough oxygen available to cell •when there is not enough water available to cells

Which human activity has the most negative effect on the stability of a lake environment

Which is a specialized feeding structure found in some mollusks? mantle radula tube foot spine

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

Why are desert solis low in organic matter?