(Q).
Q: Sexually reproducing organisms alternate between which stages? Choices: - binary and diploid - binary and haploid - diploid and traploid - haploid and diploid A:
(A).
haploid and diploid

(Q).
Q: Blood enters the heart in what valve? Choices: - tricuspid - aortic - mitral - atria A:
(A).
atria

(Q).
Q: What organism constitutes frothy green "pond scum"? Choices: - bacteria - sponges - protozoa - algae A:
(A).
algae