Human Population

The presence of wastes, such as plastic bags and motor oil, in lakes and streams miles away from developed areas suggests that

• ecosystems are interconnected and human action can alter ecosystem equilibrium.
• recycling programs have failed to conserve biotic resources.
• natural processes can alter ecosystem stability.
• direct harvesting practices have led to irreversible destruction of ecosystems.

 If worldwide deforestation (removal of forests) is not regulated, what could most likely result?  

• Acid rain could lower the pH of rivers and lakes to dangerous levels for aquatic life
•   CO2 levels in the atmosphere could increase and contribute to global warming problems
• Plants and animals could become better adapted to living in desert conditions.
• Future generations of humans could have an excess of wood and paper products.

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-4

any undesirable factor added to the air, water, or soil

• particulates
• ozone
• pollution
• smog

Tags

NGSS.MS-LS2-4

Which of the following is a greenhouse gas?

• CO2
• SO3
• CFC
• NO2

shows accumulation of toxins in the food chain

• biodiversity
• global warming
• biomagnification
• induced species

species brought into an ecosystem by humans that are non-native and harmful to the ecosystem

• invasive species
• introduced species
• umbrella species
• indicator species

wide variety of life on the planet

• biomagnification
• indicator species
• invasive species
• biodiversity

Which member of the food chain is MOST affected by mercury, a fresh water pollutant?

algae --> zooplankton--> small fish --> large fish --> hawk

• algae
• zooplankton
• large fish
• hawk

Which of the following is the most likely cause of acid rain?

• introduced species into a lake
• air pollution from smoke stacks
• planting grasses and trees near lakes and fertilizing them
• ecological succession

Which of these is a threat to the survival of an ecosystem?

• predator-prey population cycles
• less biomass at higher levels of the food web
• a shrinking variety of animal and plant species (biodiversity)
• competition among some consumer populations