Topics: Biology Quiz
the backflow of blood stops in veins by …….
A. valves
B. muscles
C. heartbeats
D. lymphatic vessels
Select your answer:
Topics:
Hematologic System Muscle Anatomy Lung & Breathing Health Issues Related to Digesting System and Eating Habits Vocabulary for Organisms in Ecosystems Balanced Diet T Cells Trichology Microbial Growth Ecology & Organisms Cells, Tissues and Organs Compact Bone Digestive System and Nutrition DNA and Polypeptide Synthesis DNA and Genetic ManipulationOther quiz:
Disease, Immunity, and Phatogens › ViewA substance made from a weakened pathogen or part of a pathogen that triggers an immune response is a
A. Virus
B. Vaccine
C. Antibiotic
D. Fever
Pollution › View
We can prevent water pollution by:
A. Reduce the use of plastic.
B. Properly dispose of chemicals.
C. Clean up after your animals.
D. All of the above