What is the uppermost layer of the Earth called?

A. Lithosphere

B. Asthenosphere

C. Mantle

True or False: If an Ecosystem is out of balance then other plants and animals will be affected.

A change in allele frequency due to random events is called?

What are the structures of the respiratory system and of the circulatory system that exchange gases with each other?

What is the extremely rare condition that can cause respiratory depression?

What are the main functures of the lymphatic system?

Which one of the following is true for a theory? A) Explanation supported by experiments B) Widely accepted as true C) Supported by repeatable results D) All of the choices

Which of the following is the largest contributor to the salt ions in the ocean? sodium chloride sulfates calcium

Your body moves food thourgh the digestive tract by using a. smooth muscle b. cardiac muscle c. extensor muscle d. Flexor muscle

A group of organs that work together to perform a major function is called a (n)

Restless tectonic plates move (shift) between one and 15 cm per A. Year B. Month C. Day D. Minute