Cyanobacteria pumped this into the atmosphere, creating an ozone layer.

Nitrogen

Oxygen

Methane

Ammonia

The layer of skin that is sometimes referred to as true skin is the:

Which of the following is an example of matter? a) ideas b) sound c) water d) energy

Which of the following would be an example of Codominance? A. AB blood type B. Different shades of skin color C. Red, white, and pink snapdragon flowers D. Smooth and wrinkled peas

Where does most of the digestion occur in the small intestine?

How can a small area in the middle of the desert provide an organism what it needs to survive

Chemical reactions that release energy Question 6 options: will always explode. need catalysts to occur. often occur spontaneously. will not occur.

Match the amino acid (AA) with its correct side chain category: 1) proline A) acidic AA 2) histidine B) nonpolar AA 3) alanine C) basic AA 4) threonine D) polar AA 5) tryptophan 6) aspartic acid

In which structure of the female reproductive system are eggs priduced

In a forest, rabbits are the prey to owls. An increase in the number of rabbits in the forest would result in Group of answer choices A. an increase in the number of owls. B. an increase in the number of producers.

How are viruses different from bacteria Bacteria are heterotrophic while viruses are autotrophic. Bacteria are living organisms; viruses are not. Bacteria have a membrane bound nucleus while viruses do not.