Which of the following scientific investigations may use a compound light microscope? (Check all that apply)
1. Detect the presence or absence of a nucleus (large organelle) in cells of unknown origin.
2. Determine the diversity of microbes in a lagoon to monitor recovery after pollution.
3. Decipher whether snakes detect their prey through sound, smell, sight, touch, or a combination of senses.
4. Identify red blood cells in a patient suspected to have sickle cell anemia, in which red blood cells are sickle-shaped.
5. Examine the corona, or protein spikes, on the outside of the COVID-19 (SARS-CoV-2) virus.