Question

Derrick just got home from playing soccer on a muddy field. He is curious how different brands of laundry detergent compare in removing mud from clothes, so he sets up an experiment.

In one laundry load, he puts his muddy socks with Brand A detergent. In the next load, he puts his muddy jersey with Brand B detergent. In the final load, he puts his muddy shorts with Brand C detergent.

Afterward, he noticed that the jersey came out the cleanest. He concludes that Brand B is the best detergent for removing mud from clothes. Is his conclusion valid?
A. Yes; the experiment was set up correctly.
B. No; there were too many controls in the experiment.
C. No; there were too many variables in the experiment.
D. No; Derrick was biased toward Brand B.

Answer 1

@saifoo.khan

Answer 2

@e.mccormick

Answer 3

@EclipsedStar

Answer 4

@dan815

Answer 5

@bibby

Answer 6

@perl

Answer 7

@confluxepic

Answer 8

@amistre64

Answer 9

@zepdrix

Answer 10

@Preetha

Answer 11

It is b, because it first said detergent a and then b, c came after so then it occured after the problem of the experiment ended. Hope i helped

Answer 12

Read it carefully, and then think about what is changing. Did he test everything on one fabric type? EG, socks?

Answer 13

Thanks @learningtime1234 and @mrdoldum

Answer 14

you welcome, anytime

Answer 15

I have more questions if you could help me

Answer 16

sure

Answer 17

Awesome. Ok So here it is: #1. a. This organism is not a plant. (algae)
b. This organism is a plant. (go to step 2)
#2. a. This plant does not have vascular tissue. (go to step 3)
b. This plant has vascular tissue. (go to step 4)
#3. a. This plant's spore-producing capsule opens by splitting lengthwise. (liverworts)
b. This plant's spore-producing capsule releases spore through the tip of the capsule. (mosses)
#4. a. This plant does not produce seeds. (go to step 5)
b. This plant produces seeds. (go to step 7)
#5. a. This plant has hollow stems containing silica. (horsetails)
b. This plant does not have hollow stems containing silica. (go to step 6)
#6. a. This plant produces on the underside of its fronds. (ferns)
b. This plant produces spores in conelike tips (club mosses)
#7. a. This plant does not produce flowers. (gymnosperms)
b. This plant produces flowers. (angiosperms)
Question
Based on its characteristics, the plant called club moss is not a true moss. Examine the dichotomous key above. Which of the following sentences adequately defines a club moss?
A. Club mosses are plants that produce spores inside of their flowers.
B. A club moss is a vascular plant that does not produce seeds, but does produce spores in conelike tips.
C. Club mosses are plant-like organisms that have chlorophyll and are nonvascular.
D. Club mosses are plants that reproduce using seeds that grow in conelike structures.

Answer 18

I think it is D

Answer 19

@happysprout You need to give the characteristics for any real help.