Which of the following is a case of altruism?
1. a shrimp digs a burrow that it shares with a goby that keeps watch for predators.
2. a prairie dog gives up a foraging opportunity to keep watch for predators.
3. a baby bird aggressively begs, resulting in less food available to its siblings.
4. a plant releases allelopathic chemicals, harming its competitors and itself.
5. individuals in a flock of birds are less susceptible to predators than individuals alone.

Because jaedyn is a sociable, gregarious child, she tends to be noticed by her teachers and peers. how does jaedyn interact with her environment?

As you drive in to school, you hear a random radio-show caller arguing that sun exposure really has not been shown to cause skin cancer and that some research suggests that skin cancer is completely genetic and not related to sun exposure at all. at the time, you think that this is a silly argument and that the caller does not know what she is talking about. however, two months later, you are outside without wearing sunscreen, and you find yourself remembering that you had read something about how the sun actually does not cause skin cancer. this process is evidence that has influenced your attitude

The concept of limited government holds that