The infection of cells by the human immunodeficiency virus (HIV) requires the virus to bind to the cell surface molecule CD3 and a second coreceptor molecule, CCR5 or CXCR4. a. True
b. False

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

black

lasagna

lunch

math

yes, because even though a theory has a  lot of evidence to support it, it is not always true