Which substance, considered sacred by many North American peoples, was delivered through a sculptural art form in the form of small stone pipes shaped like animals?

Match the Artist with the correct Renaissance period:  

Elisabeth Vigée-Lebrun is best known for:

Along what path did Buddhism spread?

What do Monarch butterfly caterpillars incorporate from milkweed plants for protection?

What happened to DDT in food chains?

What is the fundamental niche of a species?

The actual set of environmental conditions in which a species can establish a stable population is called

When the Avon representative sells cosmetics door-to-door, it is an example of which type of marketing channel?

Regarding sales force compensation methods: