The 1.5 million children at work in the cocoa plantations of west Africa are an example of _________.

The global environment consists of these large spheres.

Recycling of nutrients is an example of an ecosystem _____.

In a mercury-contaminated aquatic ecosystem, what is the correct order of increasing mercury concentration?

________________ coming from human and animal excretions and pharmaceutical waste enter the environment and disrupt aquatic organisms.

_____________ refers to the increased interactions of people, companies, and governments across the world, and the integration of economics, politics, and cultures due to several factors such as improved methods of communications.

Why is only some, but not all of the energy stored in eelgrass passed onto the omnivore that eats the eelgrass?

The four main types of organic molecules in living organisms are carbohydrates, _______, nucleic acids, and ________.

Why isn’t a forest fire considered a density-dependent factor?

The number of species in a community is referred to as ____________.