bill is pushing a box with 10 n force to the left , while alice is pushing the box with 30 n of force to the right . what is the net force

Iwould you figure it out but you don't have a picture or in your question as to what the physical property you're looking for is

The teacher is mostly talking about the distillation of a mixture

Carbon based or cells?

Conservation efforts have been effective in "increasing the number of endangered species, reducing all the negative impacts of human activity, and preserving wildlife habitats".hope my answer has you : )