Final Answer:
The statements about the characteristics of marine mammals is a) True - Marine mammals are endothermic, meaning they can regulate their body temperature internally. b) True - Marine mammals have a streamlined body shape for efficient swimming. c) True - They breathe air using lungs. d) False - Marine mammals are endothermic, not ectothermic.
Step-by-step explanation:
The following statements about the characteristics of marine mammals are true:
a) They are endothermic: Marine mammals, such as whales, dolphins, and seals, are warm-blooded or endothermic, meaning they can regulate their body temperature internally.
b) They have a streamlined body shape: Marine mammals exhibit a streamlined body shape, which reduces drag in the water and enhances their swimming efficiency.
c) They breathe air using lungs: Marine mammals are air-breathing, and they must come to the water's surface to breathe. They possess lungs for respiration and rely on blowholes or nostrils located on the tops of their heads.
d) They are ectothermic: This statement is false. Marine mammals are endothermic, not ectothermic, as they can generate and regulate their own body heat internally.