40) Halley’s comet is named after the English scientist Edmund Halley because he

11) What is the age of the oldest known stromatolites, which indicate microbial life on Earth?

17) Of the following types of star, which is most likely to have planets capable of supporting life?

20) Which of the following statements about ozone (in Earth’s stratosphere) is **not** true?

Although the human genome contains only ~25,000 genes, our immune system can generate BCRs and TCRs that can recognize at least 1012 different antigens.  How is this possible?

Following hurricanes, people can be at risk of contracting                , due to contact with water that may be contaminated by rat urine.

Being given a COVID-19 vaccine would generate

A transposon is

Which of the following is not a commercially important fermentation product?

Which of the following antibody types can trigger allergic reactions by causing mast cells to degranulate?