Before photosynthesis evolved, ___ was rare in earths atmospherer

Blood that passes from the vena cava is deposited into which chamber of the heart

How does the length of string affect the number of times a pendulum will swing back and forth in 10 seconds

The region of the brain that is involved in conscious thought and intellectual function as well as processing somatic sensory and motor information is the A) medulla B) pons. C) midbrain. D) cerebellum. E) cerebrum.

What is the biggest difference between plants and animals? animals are eukaryotic plants make their own food animals are multicellular

Which freshwater ecosystem is least productive apex?

Which surface of the ocean current has the warmest water a. peru current b. north atlantic drift c. brazil current d. canary current

A forest habitat contains a great deal of plant and animal life. Using the forest habitat as a model, explain the difference between species richness and relative abundance. Discuss how each affects the survival and fitness of populations.

Sort the bones based on whether they belong to the appendicular skeleton or the axial skeleton.

Abnormally low levels of the neurotransmitter serotonin are associated with:

You are in a body of water where freshwater flows into the ocean. Which ecosystem is this?