Which best explains how greenhouse gases heat the earth?
o
a. they trap the heat from the sun that is reflected by earth.
o
b. they reflect the heat given off by geothermals.
c. they create heat from chemical reactions they cause in the
atmosphere. i
o
d. they capture the heat released by volcanoes on earth's surface.

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

Plz fast biotechnology is a growing field of applied biology. many crops such as corn have been engineered to be resistant to herbicides. therefore farmers can spray these chemicals to kill weeds growing near the crop without worries of killing the crop itself how does this type of biotechnology work? a. by changing the genetic make up of the crops. b. by causing the crops to kill the weeds. c. by changing the type of crops used. d. by changing the location of the crops.

Which statement best describes the role of religion and culture in ancient medicine?