Which of these is true of echinoderms

a. They have heads.

b. They have radial symmetry.

c. They have shells.

d. They have smooth skin.

Many of the mind altering drugs affect the brain by

Identify one fuel source in the table that is considered a fossilfuel

Which scenario causes gene flow? A:one flower pollinates other flowers in its population B: a population size decreases after a natural disaster C: new mutations arise within new populations D: an animal moves to a new population and mates

Prokaryotic cells reproduce when a single cell spits into two cells

What organisms alternate between haploid to diploid?

Which organ can be harmed if we eat too much fat?

A concerned male athlete brings a clear, red urine specimen to the physician's office. a. would you expect to see rbcs in the microscopic examination?

Rocks have been found in South America that are very similar in makeup and age to rocks in South Africa

In humans Select one: a. back muscles are strong to maintain erect posture. b. deep back muscles extend from the vertebrae to the ribs. c. most of the muscle mass in the lower back is from the spinalis muscle. d. back muscles are not very strong. e.

Why are hurricanes common in Florida?