There are two ways you could look at this. If we got rid of all viruses, then less people would die. This is obviously a good thing as so many families are devastated by virus related deaths every year. However, all these extra people could lead to surplus population which, as history has shown, leads to drought, famine, and the eventual down fall of the empire/nation/etc
She could tie the plastic bag up to a branch and wait for rainwater. If it's a jungle, that is the cleanest water you might find.
Explanation:
Mendel crossed two unlike parents to get offspring with characterestics that differ that of the parents
Fire naturally occurs in a grassland ecosystem and it helps the environment stay healthy and strong. I promotes richer soil as well as gets rid of excess leaves scattered around. After a fire, grassland ecosystems can grow again and be better than they were before.
The embryos of many kinds of animals have gills slits. Gill slits developed into gills in fish and into ears of mammals. Relating in thinking there are ancestors.