12. Which of the following would exert pressure on a population of squirrels? a. Disease
b. Predators
C. Availability of food
d. All of the above

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

Which of the following are responsible for sending messages from the hypothalamus to the thalamus?

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.