Which statement about protozoa is correct?

What does PCR do?

Which of the following is an appropriate definition for immunological memory?

Which of the following is a correct function of the CD4 protein on T cells?

Which of the following attributes of covid-19 make it an especially challenging infectious disease for public health authorities to control?

Why does genetic drift have a greater effect on smaller populations than on larger populations?

Why are homologous traits similar?

When could an epidemic stop and die out?

What does herd immunity mean?

Which of the following would provide evidence that a parasite and its host have co-evolved?