Elements such as carbon can move through the environment and organisms in a cycle because
living and nonliving things interact in .
A. cells
B. species
C. organisms
D. ecosystems

Tlymphocytes mature in the? a. thyroid gland. b. bone marrow. c. spleen. d. thymus.

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction.

Pulmonary arteries carry highly oxygenated blood. true or false?