Which of the following is a primary advantage of semisynthetic drugs?
a. they must be administered intravenously.
b. they work faster
c. they are less stable and consequently have fewer side effects
d. they are not readily absorbed.
e. they are more effective than the unmodified natural antibiotics.

During which phase does earth see more than half of the moon's surface? 1)first quarter2)third quarter3)waxing gibbous4)waning crescent

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?

Where is muscle tissue found in the body?