Q: What is the disease in which bones lose mass and become more fragile and likely to break? Choices: - arthritis - tuberculosis - fibrosis - osteoporosis A:
osteoporosis

Q: What are plants called that grow where you don't want them? Choices: - grasses - shrubs - reeds - weeds A:
weeds

Q: Q: What do we call the theory of electromagnetism on the particle scale? Choices: - iron electrodynamics - light electrodynamics - gravity electrodynamics - quantum electrodynamics A:
A: quantum electrodynamics

Question: Q: What do you call a predator species that affects other species' populations when its own population size changes? Choices: - paradox species - symbiotic species - complement species - keystone species A:
Answer: keystone species

*Question*
Q: What type of pressure is the pressure exerted by gas particles in earth's atmosphere as those particles collide with objects? Choices: - vertical pressure - adjacent pressure - adjacent pressure - atmospheric pressure A:
**Answer**
atmospheric pressure

Q: What trophic level are secondary consumers (which eat primary consumers) considered to be? Choices: - trophic level 5 - trophic level 4 - trophic level 2 - trophic level 3 A:
trophic level 3