Ghrelin is a(n):
a. gastric hormone that stimulates appetite.
b. liver enzyme that promotes the excretion of fat.
c. hormone produced by adipose cells that decreases appetite.
d. intestinal hormone that raises insulin concentrations.

Apart of an ecosystem that can restrict the growth of a population is referred to as

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

About __ of the mass of the cell is water