Q: Fact 1: Cutting down trees has a negative impact on an ecosystem. Fact 2: An example is the uncontrolled cutting of trees for fuel. Given the two facts above, answer the question " uncontrolled use of what for fuel has a negative impact on an ecosystem" with the following options: - trees - oil - deserts - habitat - solar - air - coal - rocks
A: trees

Q: Fact 1: Cells vary in size as well as shape, but all cells are very small. Fact 2: Bacteria are single-cell microorganisms that are so small they can only be seen with a microscope. Given the two facts above, answer the question "Cells vary in size and shape and can only be seen with what?" with the following options: - a microscope - heightened senses - a telescope lens - colors - Solar energy - by indirect light - a good eye - A computer
A: a microscope

Q: Fact 1: Ice wedging is when ice causes rocks to crack by expanding in openings. Fact 2: Ice wedging is the most important form of mechanical weathering. Given the two facts above, answer the question "What is the most important part of mechanical weathering?" with the following options: - roots and shoots - when they liquify - roots to grow - when it melds into soil - volcanic rock cracking - a tree falling - the looseness of soil - ice causes rocks to crack
A: ice causes rocks to crack

Q: Fact 1: Killing microorganisms in food can be used to extend the shelf life of that food. Fact 2: Sterilization kills all viable microorganisms. Given the two facts above, answer the question "What can be used to extend the shelf life of that food?" with the following options: - sterilization - Enzymes - poison - chemical changes - hybridization - gasoline - rays or beams - Cooking
A: sterilization