What does a ‘1’ mean in binary code?

a a switch is set so that an electrical charge can flow.

b there is data at this digit’s location.

c a switch is set so that an electrical charge cannot flow.

d there is no data at this digit’s location.

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal responds by in order to its core temperature?

Which structure in the cardiovascular system connect arteries to veins?

Where is having brightly colored feathers that attract mates most clearly an adaptation for a bird? a. a forest with dense vegetation b. a sandy beach beside an ocean c. a snowy tundra with little vegetation d. a swamp with many hawks that eat birds