Which of the following is the best evidence (proof) that digestion involves a chemical change? A. The body produces substances that aid in digestion in the mouth (saliva) and stomach (acid)

B. The beginning and end amount are equal

C. Teeth break down food into smaller particles

D. The esophagus uses peristalsis to move the bolus down to the stomach.

In 2015, about ten percent of total u. s. energy consumption was from renewable energy sources. renewable energy plays an important role in reducing greenhouse gas emissions. when renewable energy sources are used, the demand for fossil fuels is reduced. sanjay and his family want to cut back on their use of non-renewable resources at home. they are thinking of an alternate way to heat their home without adding more greenhouse gases or pollutants to the environment. which renewable resource would not fit into their plan? a) solar power b) burning wood c) constructing a wind turbine eliminate d) generating hydroelectric power

Which characteristics are typical of a human population in the postindustrial stage?

Amines amides and amino acids are categories of