What are physical properties? a. the difference between a substance and a mixture b. the difference between a heterogeneous and a homogeneous mixture c. characteristics used to tell the difference between matter d. properties that can change the chemical composition of matter (apex)

physical properties can be measure by changing the composition of matter. physical properties are generally used to mention and observe matter. physical properties describe the appearence, texture, color, odor,melting and boiling points,solubility, polarity and  many others. physical properties occurs without changes in molecular composition. physical properties can be observed  without changing a substance's identity.

so the answer is D); Properties that can change the chemical composition of matter

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above

layer 3 is younger than layer 6.