If the ideal habitat for new stands of cottonwood require sediment, then what is required for the ideal habitat for new stands of cottonwood? Answer choices: - sunlight - nutrients - warmth - Sediment - Black tar - Hot magma - trees - Chainsaws
Sediment

If snails live in most terrestrial, freshwater and marine habitats, then what kind of animal lives in most terrestrial, freshwater and marine habitats? Answer choices: - animals - swimming - snails - tortoises - barnacles - swea - protected - a fish
snails

Q: If pigs may compete for territory, water, food, or mates, then what may compete for territory, water, food, or mates? Answer choices: - humans - pigs - Birds - density - gravity - clouds - bears - koalas
A: pigs

Question: If afirecracker converts chemical energy into vibrating waves, then afirecracker converts chemical energy into what? Answer choices: - kinetic energy - Loud noises - vibrating waves - An object is seen - electromagnetic energy - deoxyribonucleic acid - hydrogen and oxygen - harmful substances
Answer: vibrating waves

*Question*
If testosterone causes the penis to develop, then what causes the penis to develop? Answer choices: - Creatine - Energy - Estrogen - Testicles - matter vibrating - Testosterone - movement - It expands
**Answer**
Testosterone

(Question)
If salamanders have a relatively complex circulatory system with a three-chambered heart, then which animal has a circulatory system with a three-chambered heart? Answer choices: - animals - Salamander - fur seals - mammals - alpacas - a fish - warm-blooded - barnacles
(Answer)
Salamander