Why are trees considered to be producers?
a. they do not need food to survive in an ecosystem
b. they depend on consumers to them make their food
c. they get their food from other sources
d. they make their own food using energy from the sun

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

The arrows in the illustration point to

Which of the following terms describes all of the non-living components of an ecosystem