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

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.