Zinc has a positive impact on the healing of wounds, and nutrition correlates with wound healing. Given these facts, what is linked to wounds recovering faster among the following options: - warmth - Zinc - heat - ferns - O3 - fever - energy - fibers
Zinc

Phase changes do not change mass, and melting is a phase change. Given these facts, what does not change during melting among the following options: - Solid - Density - energy - vapors - O3 - fats - Mass - Sublimation
Mass

Cutting down trees has a negative impact on an ecosystem, and ecosystems are living communities. Given these facts, cutting down what has a negative impact on living communities among the following options: - bushes - on calories - habitat - manmade structures - invasive species - disease - bamboo - trees
trees