Why might the knoblike proteins on the outer surface of hiv hold a key to the production of a vaccine against aids?

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

In 2015, about ten percent of total u.s. energy consumption was from renewable energy sources. renewable energy plays an important role in reducing greenhouse gas emissions. when renewable energy sources are used, the demand for fossil fuels is reduced. sanjay and his family want to cut back on their use of non-renewable resources at home. they are thinking of an alternate way to heat their home without adding more greenhouse gases or pollutants to the environment. which renewable resource would not fit into their plan? a) solar power b) burning wood c) constructing a wind turbine eliminate d) generating hydroelectric power

Which locations on the map are low-pressure areas? a b c d e