Which of the following make acid rain a. carbon dioxide and sulphur monoxide b. carbon dioxide and sulphur dioxide c. carbon monoxide and sulphur monoxide d. carbon

Which of the following descriptions of proteins are true? i. proteins can have different sequences of amino acids. ii. proteins can have different shapes. iii. proteins can have different numbers of amino acids. a. only i and ii are true. b. only ii and iii are true. c. only i and iii are true. d. i and ii and iii are all true. e. none are true statements

Environmental differences within ecosystems are generally caused by

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -