During gas exchange, oxygen and carbon dioxide always move:
A) into the blood. B) out of the blood.
C) into the alveoli. D) down their concentration gradients.
Answer: D
You might also like to view...
How do eukaryotic plant and animals cells differ from one another?
A. Animal cells have mitochondria and plant cells have chloroplasts. B. Plant cells have a vacuole and animals cells don't. C. Animal cells have endoplasmic reticulum and plant cells don't. D. Animal cells have a plasma membrane and plant cells have a cell wall.
Donor cells in conjugation are labeled ____ cells, whereas recipient cells are labeled ____ cells
a. F+; Fb. F+; F+ c. F-; F+ d. F1; F2 e. F+; F2
About 250 million years ago Earth’s continents merged into one supercontinent called ____
a. Nazca b. Eurasia c. Laurasia d. Gondwana e. Pangaea
The source of life's diversity originates from differences in ________ .
a. DNA molecules b. sulfur backbones c. carbohydrate reservoirs d. lipid molecules e. cell wall structure