I need help very quickly! There are approximately 7.7 billion humans on Earth. If the virus spreads beyond the 200-person town, how long will it be until everyone on the planet is infected? Another part of the question is "Some viruses are more contagious than others. Instead of passing the virus to one new person, imagine each infected person passes it to three. How will this affect how long it takes for the virus to infect everyone on earth?"

Robert wants to know which fertilizer will work the best for his grass. what can he do to explore this inquiry?

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

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