Science
farmer bob decides to use a compound pulley to raise a box up to the top of his barn.
what is the purpose of using a simple machine in this case?
a) to reduce the amount of friction
b) to reduce the distance the box has to travel
c) to reduce the amount of work needed to lift the box
d) to reduce the amount of force needed to lift the box

The graph shows the amount of global warming happening in different ecosystems. which populations of organisms will likely decline the most as a result of climate change, and why? a.coral reefs because of the loss of the symbiotic algae living within their bodies b.penguin populations because the fish they eat will move into warmer waters c.mountain-dwelling birds because rising sea levels will relocate their food sources d.large cats in the rainforest because of decreased habitat loss for their prey

Recombinant dna is the merging of dna from unrelated organisms to create new genetic varieties is assembled in the lab from mononucleotides was part of the green revolution of the 1960s is pollination of one plant by another of the same species is cross-pollination of one plant by a different species

Does anyone know what the schooling version of sos mean? example