dinosaurs are now extinct
Answer:
D
Explanation:
because air is made up of nitrogen,carbon dioxide, Argon and oxygen
The answer is $10 because 160-150=10
Theories are a collection of scientific data that is generally accepted and reproducible. Theories are a result from several repeated experiments, but theories are not based on a single hypothesis. Several hypotheses are tested and appraised to become a well accepted theory. Theories may also be revised over time and can predict what may happen in the future. On the other hand, theories are not proven facts.
Contour: Gives the bird its stream line shape.
<span>Down feathers: Keeps the bird warm.</span>
