What of the following describes how an organism responds to external stimuli

a. the human body reduces sweating when it's water levels are low

b. a dog eats food when it is hungry

c. a person yawns when oxygen is low in the lungs

d. blinking occurs when dust hits the human eye

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

3points hurry! what is the relationship between biotechnology, sharkskin, and disease resistance? bioengineers have developed an artificial sharkskin that does not allow resistant bacteria to grow on it. disease-causing microbes have been genetically modified to keep them from infecting the skins of sharks. scientists have created a device that can be attached to the skins of sharks that dramatically increases their abilities to resist disease. sharkskin produces many chemicals that can be collected and used to create antibiotics.

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction.