Approximately 80% of HIV diagnoses in the USA are among people who become infected through sexual exposure. Thus, of the approximately 40 000 new HIV infections each year in the US, 32 000 are sexual transmissions. Our results indicate that the HIV-positive unaware group contributes disproportionately to these new infections relative to their percentage of the HIV-positive population in the USA.
Dark red and blue-green indicate regions of high photosynthetic activity in the ocean and on land, respectively. Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities (energy transformation).
Key content 1. photosynthesis is a cellular process through which organisms capture light energy from the sun and use it to generate and store energy. 2. cellular respiration releases stored energy in glucose, allowing the organism to function. 3. Light is required for photosynthesis to occur, although parts of photosynthesis can happen in the absence of light. 4. photosynthesis happens in the chloroplasts, which con-tain chlorophyll. 5.