CAN SOME PLZ HELP I REALY NEED THIS PLZ What are all the answers in edgeunity science first unit test.
IF U ANSWER RIGHT BRAINLEST WILL BE GIVEN plz and thank u ⊂:

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b. slope c. benchmark d. index contour

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness