This substance makes up the majority of your cells, and is necessary for them to carry out most of their chemical reactions. what is it?
a) carbon
b) oxygen
c) sugar
d) water

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat

In 1992, hurricane andrew left a wake of destruction through florida. one victim of the storm was a reptile-breeding facility. over 900 burmese pythons were set free, and today thousands of pythons live in florida. these pythons are an invasive species, or a harmful species not native to the region. 1. what impacts do you think the burmese pythons might have on local ecosystems