Autotrophs only heterotrophs only
both autotrophs and heterotrophs
transform energy in sunlight
into chemical energy
aut eophs only
utilize chemical energy in organic
molecules as a source of energy
derive energy by consuming
organic matter
produce the pigment chlorophyll
perform a series of reactions
called the Calvin cycle
perform a series of reactions
called the Krebs cycle

Which ideas did your answer contain? check all that apply. no food for organisms no oxygen in the atmosphere no trees or flowering plants no products based on trees or plants (building materials, medicines, fuels, fibers) no fossil fuels

What might explain the real-world results, show in the graph to the right, for one class of twenty students? check all that apply.

Which of the following is an advantage of using embryonic stem cells in medical research? a. the use of embryonic stem cells is much less expensive than the use of adult stem cells. o b. no living tissue is damaged when scientists use embryonic stem cells. o c. embryonic stem cells are able to differentiate into a wider range of cells than adult stem cells. d. there is no controversy surrounding the use of embryonic stem cells.