Levels of oxygen and carbon dioxide in the blood are tested by

Describe three properties of mitochondria and chloroplasts that support the endosymbiotic theory. Be sure to explain your answer.

How is producing offspring an advantage over producing identical offspring?

Why might early migration be harmful to bird population

The vena cava pumps blood from the heart to the rest of the body a. True b. False

Earthquake victims often are left without drinking water because

Compare and contrast photosynthesis and cellular respiration. you must write at least 1 similarity and 1 difference

Which of the following is the longest distance from Earth? A. the distance to the nearest star beyond the Sun B. the distance to the edge of the Universe C. the distance to the next galaxy D. the distance to the edge of our solar system

Which activity would eventually result in a stable ecosystem?

What cell structure would a leaf or a tree have that a fingernail wouldn't A. mitochondria B. Cilia C. chloroplasts D. ribosomes

Which phrase defines a law? a possible explanation or answer to a scientific question that is based on prior knowledge or research and is testable A statement of fact that is generally accepted to be true and universal because it has always been