4 The discovery of cells was made possible by the invention and refinement of the microscope. Over the years, different individuals provided evidence
for what is now known as the cell theory, Four scientists are primarily credited with establishing the three basic concepts of the cell theory
Mark one box in each row of the table below to identify the scientist(s) most associated with the cell theory concept listed
Schleiden and
Schwann
Hooke
Virchow
All living things are made of cells; plants and animals are
made of cells
Cells come from cells: diseased cells produce diseased cells
The cell is the basic unit of life: cells can be studied
scientifically

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.