water
what percent of the earth water is salt water
97%
what is Symbiosis
it is the close relationship between two or more species
what percent of the earth is water
71%
There is no such thing as a permanent pond.
true or false
true
An egg is how much percent water
74%
A special concern in aquatic ecosystems is the introduction of what
alien, or exotic species
There are five named oceans what are they cover about what percent of the earth
1. the Arctic, Atlantic, Indian, Pacific, and Southern
68 percent
Freshwater ecosystems are commonly divided into two main types what are they?
standing-water ecosystems also known as lentic, or still waters and flowing-water ecosystems also known as lotic or running waters
Water is most dense at roughly what degrees
39o F
The water molecule is composed of two hydrogen atoms and one oxygen atom that bond asymmetrically by sharing electrons to form a
polar molecule,
Southern Bottomland Forest also called Southern Floodplain Forests take up how many acers in north Carolina
2.7 million
Bodies of water can be divided into depth zones name them
1. photic or euphotic zone.
2.aphotic zone
3.the benthic zone
Unsafe water, poor sanitation, and hygiene cause approximately how many deaths
3.5 million deaths worldwide;
Some organisms create habitat for themselves and other species. These animals are known as
keystone species
what percent of North Carolina State are considered wetland.
17 percent
Various insect larvae, crustaceans, and fish can only live with a certain pH level of the water The pH level can be changed by
acid precipitation
Liquid water is how many times denser than air
800 times
The rapid change in temperature cannot be tolerated by some organisms and causes?
thermal shock
freshwater River water and seawater contain an average of how much dissolved salts
0.1% fresh water 3.5% salt water
The Importance of Wetlands name 5
• they help recharge groundwater.
• they help control floodwaters.
• they filter pollutants.
• they slow water allowing sediment and pollutants to settle rather than entering streams.
• they support fisheries.
• they provide habitat for wildlife and waterfowl.
• they are sanctuaries for rare and endangered species.
• they have educational, recreational, and aesthetic value.
• they store excess water during times of flooding.