1) How does the green algae Chlamydomonas reproduce when conditions are unfavorable? A) Haploid cells of different mating types fuse to form a diploid zygote. B) Haploid cells reproduce asexually by meiosis. C) Diploid cells produce male and female gametes that fuse to form diploid zygotes. D) Chlamydomonas does not reproduce during unfavorable conditions. 0) Why are the fossil remains of dead foraminiferans in sedimentary layers useful to scientists? A) The presence of certain types of tests can indicate the presence of oil. B) Foraminiferans can be used as index fossils to date sedimentary rock. C) They provide evidence of the antiquity of protists. D) All of the answer choices are correct. .