The following statements refer to events that happen following infection with HIV, leading to the onset of AIDS.
1. The body becomes immunocompromised
2. Low levels of antibodies in blood
3. The lymphocytes count drops
4. Frequent opportunistic infections occur
What is the correct order of events? List them in order separated by commas.

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

Approximately what portion of the foods that we eat have been genetically modified in some way? a. fewer than 10% b. about 50% c. nearly 100%

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000