Human Effects on Ecosystems

In the future, how do you predict natural ecosystems will be able to cope with the effects of human activities?

• will not be able to adapt and will vanish

• will adapt the same way as they do today

• will find it more difficult to adapt

• will improve their ability to adapt

Natural ecosystems are under increasing stress because of ____________.

• human activity

• a growing population of animals

• daily weather changes

• a growing population of plants

Based on the current trends, which choice best describes how the next generation of humans will think about their effect on natural ecosystems?

• They will care more than people care now.

• They will care less than people care now.

• They will not be concerned.

• They will care the same as people today do.

Which human activity probably does the most harm to natural ecosystems?

• running on a trail

• flying a kite

• swimming in the ocean

• traveling in a car

Humans are ______ their effects on natural ecosystems.

• becoming less sensitive to

• not aware of

• totally aware of

• becoming more sensitive to

Human activities affect natural ecosystems. Which generally describes how people feel about this fact?

• do not really think about it

• becoming more concerned

• care less than they used to care

• most people disagree with this

Which best describes how human activity affects natural ecosystems?

• helps them grow and mature

• stresses them less than in the past

• does not affect them

• increasingly stresses them

Natural ecosystems are under increasing stress because of __________.

• human activity

• a growing population of animals

• daily weather changes

• a growing population of plants

Human activity can upset the balance of an ecosystem by making_________

• air

• oxygen

• pollution

• water

A certain species of seal would eat fish that were hunted for food and sport by fisherman. Over a period of time the seal population declined. What is the possible cause of the decline in seal population?

• loss of habitat

• change in sea level

• reduced food sources

• change in the weather