Problem: OPTIONS:
- oxygen
- water
- heat
- energy
Q: Q: All living things require what, which most ecosystems obtain from the sun? A:
Answer: energy

Problem:OPTIONS:
- features
- viruses
- diseases
- hosts

Q: Many parasites have complex life cycles involving multiple ? A:
****
A: hosts

Q: What do you call a group of organisms of the same species that live in the same area? A:
OPTIONS:
- system
- ecosystem
- biosphere
- population
population

Q: The purpose of any cooling system is to transfer what type of energy in order to keep things cool? A:
OPTIONS:
- radiation
- atmospheric
- physical
- thermal

Answer: thermal

Question: Q: What's the term for a relationship between two organisms where at least one benefits? A:
OPTIONS:
- dermatitis
- morphogenesis
- meiosis
- symbiosis
Answer: symbiosis

input: OPTIONS:
- digestion
- fight or flight
- hormones
- immune Now, answer this question: Q: An antigen is a molecule that reacts with some component of the what response? A:
A:
output:
immune