Penicillin was discovered by

1. flemin

2. jenner

3. robert brown

4. laveran

The energy required for muscle contraction comes from A. ATP. B. ligaments. C. oxygen. D. chlorophyll.

Which of the following do a frog, worm, and pine tree have in common? A. They are all eukaryotic organisms that have nuclei in their cells. B They are all prokaryotic organisms that have free DNA in their cells.

Explain why a sound wave can't travel from a satellite to earth

assess the similarities and differences between the somatic nervous system and the autonomic nervous system

If steel is more dense then a lake water why can a boat float

Name the three energy roles that organisms fill in an ecosystem.

Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine. Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine. True False

Which of the following are examples of the first specialized tissues?

Which structure of the trachea prevents it from collapsing inward and obstructing the air passageway?

What is a Divergent boundary and where is located?