What is the best summary of this passage? Select one:
a. An external stimulus comes from outside the organism. Animals respond to stimuli through learned behaviors and instinct.
b. Phototropism is a plant’s response to turn toward light. Gravitropism is a plant’s response to grow upward against gravity.
c. Stimuli trigger responses in organisms that allow them to maintain constant internal conditions through homeostasis.
d. Homeostasis is a set of mechanisms that work to maintain stable internal conditions as external conditions change.

Christie's doctor recommends that she eat 40 grams of protein a day. she's already consumed 50% of her protein recommendation for the day. how many servings of the given snack should christie have to meet her daily protein recommendation?

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !

Overtime the pond slowly becomes more acidic due to the release of chemicals from a nearby factory. which of the organisms would most likely survive the change to their environment?