<u>Answer</u>: c. a and b
Trees play vital roles in the production of oxygen as well as the fixation of carbon from 
. As trees use nitrogen, phosphorus and water as nutrients for growth, their diminishing numbers would change the balance between these three elements significantly.
Thus, during rains, the water level will rise much faster and higher in the absence of trees. These could possibly lead to increasing cases of devastating landslides.
Science and technology have influenced everyday life for thousands of years. If it hadn't we would still be living in caves and struggling to stay alive. Everything you see around you is a form of technology. Science itself can be considered a form of technology because it has helped us advance as humans and become more able to overcome disease and predators. Most humans today wake up and are subjected to technology's control because we've fed into it so much that it would extremely hard, if not impossible, for us to survive without it.
Answer:
D) Heterotrophs can make their own food
Answer:
The main purpose of cell respiration is to:
b. convert the chemical energy in sugars into ATP
Answer:
Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air.
