Mutagens such as pollutants and uv light can cause mutations in dna to occur at a higher rate than normal. these mutations may be beneficial in some cases, but often they lead to cancer. which of the following best describes how cancer cells affect the body?
a. they cause the immune system to produce antibodies, which attack healthy cells along with the cancer cells.
b. they consume normal cells and use them as fuel to reproduce and attack more healthy cells.
c. they have an abnormally short cell cycle, and they die faster than the liver is able to remove them from the body.
d. they take nutrients needed by healthy cells, and as they grow they interfere with the function of normal cells and organs.

Sally and sue were investigating the topic of friction in science. they used a small car and a ramp as seen in the picture to test what they were learning. they knew that they slipped easily on waxed floors but not on carpet, so they decided to change the material on the surface of the ramp to see what happened. they planned to use glass, carpet, aluminum foil, and sandpaper and run the car down the ramp over each surface. what would be the best research question to guide the girls' experiment? a) does the amount of surface area affect the friction on the moving car? b) will the car travel fastest on the glass surface? c) how does the angle of the ramp affect the speed of the car? d)do rougher surfaces tend to create more friction than smooth surfaces?

Which of the following is not a potential result of deforestation?

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.