Altitude (m) River Gradient Plot
2,000
1.800
1,600
1,400
1,200
0 500 1,000 1,500
Stream distance (m)
2,000
A river gradient plot shows how quickly the
elevation of a river falls along its course. The slope
of the line is the river's gradient. The line has a
steep slope at points along the river where the
gradient is steep. The line has a nearly level slope
where the river gradient is shallow.
Identify
7 Along this river, at which two approximate altitude
ranges are the gradients the steepest?

What percentage of light hits earth's surface directly?

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.