Q: What chemical element is required for a combustion reaction ? Choices: - carbon - helium - nitrogen - oxygen A:
oxygen

(Question)
Q: What type of blood cells transport oxygen to the tissues so they can function? Choices: - white blood cells - mutated blood cells - depleted blood cells - red blood cells A:
(Answer)
red blood cells

Ques: Q: Adult sea stars have what kind of symmetry? Choices: - hydrological symmetry - skeletal symmetry - biological symmetry - radial symmetry A:
Ans: radial symmetry

(Q).
Q: The rate at which an unstable isotope decays is measured in a unit known as what? Choices: - full-life - staying-life - half-time - half-life A:
(A).
half-life

Ques:Q: Amino acids contain both a carboxylic acid group and what other group? Choices: - lipid - fatty - compounds - amine A:

Ans:amine

Question: Q: What lens shape corrects myopia? Choices: - flat - convex - curve - concave A:
Answer:
concave