Carbon/nitrogen cycle
During the process of ______ plants use water, carbon dioxide from the air and energy from the sun to form sugar molecules and oxygen.
photosynthesis
________ is the process of liquid water changing into a vapor or gas
evaporation
A ____ is any physical hazard life caused by having too much or too little of things needed for life.
stress
Plant and animal species that originally live in an ecosystem are called
Native species
Ecosystems often undergo many kinds of stress, what are the three they tend to have
droughts, floods and fires
______ is the process in which organisms use sugar molecules and oxygen to produce energy.
Respiration.
Tiny opening, called stomata allow water vapor to move out of the plants this is called
transpiration
a _____ occurs when an ecosystem receives more water than it can use or store
flood
Species that are not native to the area and can cause harm are called
invasive species
What is the largest man made stress
Habitat destruction
Nitrogen cycle is also an _________ process
important
The droplets collect in the clouds and then fall to the earth as
precipitation
A ______ occurs when an ecosystem receives less rainfall than it needs
drought
Scientists consider a species to be _______ when its last known member dies
extinct
____ is another major man made stress
Pollution
________ gas is part of the air that we breathe
nitrogen
Some precipitation soaks into the ground and is stored there, this water is known as _________
grown water
The Gradual changes in the populations of organisms in an ecosystem are called
succession
A species becomes ______ when its population is so small that the species may become extinct.
endangered
By the early ________ the number of puffins had decreased greatly.
1900's
When plants and animals die, other kinds of bacteria act as
Deccomposers
The process of water vapor changing to a liquid is called
condensation
Many forest ____ are started through man's carelessness.
fires
A species is _________ if its population could become
endangered in the near future
threatened.
Hundreds of years ago many Atlantic puffins lived in ___________
north america