Please help!! Huge mountain systems, like the Himalayas, are created when

A. continental crusts rub past each other

b. continental crusts collide and fold

C. oceanic crusts subducts under

D. continental crust
oceanic crusts pull apart

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

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.