About how often do Earth's magnetic poles reverse?

O

A. Every 22 years

O

B. Every 100 million years

O

C. Every billion years

O

D. Every 250,000 years

Why does exhaled air contains less oxygen than inhaled air

On the pH scale where can you find the strong acids and strong bases

Describe how the schwann cells form the myelin sheath

Name three STIs that can be life-threatening or lead to life-threatening illnesses.

the majority of thyroid are secreted as blank but small amounts of blank is also secreted from follicle

The parasympathetic division of the autonomic nervous system A. is associated with "fight or flight." B. opposes the effects of the sympathetic division. C. arises from parts of the spinal cord. D. uses the neurotransmitter norepinephrine.

Organisms which can make their own food are found in this kingdom:

What are hormones and why are they important?

What is the central dogma that tells how information is transformed to make a protein

Select one organism from above and describe how it functions in the energy pyramid