Which systems work together so oxygen can be distributed to the cells of your body? How do these two systems work together to accomplish this task?

Trees maintain the balance between gases in the air, removing carbon dioxide from the air and releasing oxygen. true or false

What are various colors, patterns, and marks characteristic of a particular species?

Which type of reaction occurs in the sun to release light and heat? A. nuclear B. chemical C. fission D. cohesion

Describe the process of meiosis that ensures that both maternal and paternal chromosomes are passed on to each spermatozoon

Explain how speciation, directional, disruptive, and stabilizing selection affect biodiversity.

What are some examples of aibiotic factors?

Nearly all cells found in multicellular organisms have similar needs as a result most organisms have developed similar what to meet those cell needs

Which is the fifth most common pool where carbon is stored apart from the Earth's crust, ocean, soils, and atmosphere?

A person is walking through a park. A branch from a tree falls, nearly hitting her. Her heartbeat speeds up. Which part of the nervous system was responsible for this?

A traveler finds herself in a biome that is full of trees. She notices that there are many plants growing on the ground. Which of the following clues would confirm which biome this is? A. Many animals are ending their hibernation. B.