Which type of sentence is this? astronauts can experience bone loss, muscle weakness, and diminished heart function when they are exposed to environments with reduced gravity for a prolonged period of time.
a) simple
b) compound
c) complex
d) compound-complex

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures

What is the most abundant vertebrate on earth?

Black fur(b) in guinea pigs is dominant over white fur(b). find the probability of a homozygous offspring in a cross: bb x bb. a. 0% b. 25% c. 50% d. 75% e. 100%