Which best describes the blood flowing in an artery?
a. it contains no red blood cells.
b. it is oxygen poor.
c. it moves away from the heart.
d. it contains no white blood cells.

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

How do chloroplasts set plants apart from other living things

The tubes transporting minerals and water upward are called ?