The two principal ways to describe earth’s structure are based on the

a. chemical composition and thickness of layers
b. chemical composition and mechanical properties of layers
c. mechanical properties and thickness of layers
d. the composition and viscosity of minerals

Brainliest ! is slowing down a car an example of acceleration? explain. - explain correctly

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.

Which of these is not a nucleotide base found in dna?