Birth Rates and Death Rates
This rate measures the number of deaths per 1,000 people each year.
What is the death rate?
This term describes an organism that hunts and eats another organism for food.
What is a predator?
This type of graph shows the distribution of a population by age and gender.
What is a population pyramid?
This element is added to water to kill bacteria and make the water safer to drink.
What is chlorine?
A designated area where trash is buried and compacted is called this.
What is a landfill?
When a country’s birth rate is higher than its death rate, this happens to its population size.
What is population growth (or increase)?
When the prey population increases, the predator population usually does this soon afterward.
What is increase?
A population pyramid shaped like a triangle pointing up for ages 15-45 usually indicates this type of population change.
What is growth?
The development of this network of pipes in the 1800s and early 1900s dramatically reduced deaths from infectious diseases.
What is a sewer?
This “R” involves turning old materials into new products, like making plastic bottles into plastic lumber.
What is recycle?
In developed nations, the birth rate tends to be _____________ than in developing nations, partly because of women's education and career opportunities.
What is lower?
A habitat with more hiding places for animals will likely cause the prey population to do this.
What is increase?
In this stage of population growth, both birth rates and death rates are high, resulting in little overall population change.
What is Stage 1 (pre-industrial)?
This general term refers to diseases that are spread when waste contaminates drinking water or food.
What are waterborne diseases?
Modern landfills often include this to prevent harmful chemicals from leaching into the soil and water.
What is a plastic liner (or tarp)?
A mathematical equation using birth rate and death rate to determine population growth.
What is birth rate - death rate = growth?
A squirrel would be considered a _____________ to a grizzly bear, since they both eat acorns.
What is a competitor?
A rectangular-shaped population pyramid represents this type of population growth.
What is no growth?
This deadly disease, once common in areas with poor sanitation, is caused by Vibrio cholerae and spreads through contaminated water.
What is cholera?
This is the practice of using materials again in their original form instead of throwing them away.
What is re-use?
During this stage of the Demographic Transition Model, death rates drop sharply due to better sanitation and medicine, but birth rates remain high.
What is Stage 2?
When wolves were reintroduced to Yellowstone National Park, they indirectly caused an increase in tree growth because of this.
What is there were fewer deer and elk eating the trees?
A population pyramid that is narrow at the base and wider at the top indicates this population trend.
What is a declining population?
These tiny organisms, such as bacteria and viruses, can cause illness if water is not properly cleaned.
What are pathogens?
This type of product makes up the largest percentage of trash in a landfill.
What is paper?