Which statement is true? O Gravity can both push and pull objects.
O Only celestial objects exert a gravitational force.
O Only Earth exerts a gravitational force.
All objects with mass exert a gravitational force.

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.

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.

How are fossils most commonly formed