Manuel is performing a scientific investigation to determine whether fertilizer A or fertilizer B is more effective at increasing the growth rate of tomato plants. Manuel measures and separates 30 tomato plants into two equal groups that are planted in identical environments. He gives one group fertilizer A, and gives the other group the same amount of fertilizer B. During the first week of the investigation, he gives the tomato plants in both groups the same amount of water. During the second week, however, he forgets to water the tomato plants being given fertilizer B, but still provides water for the tomato plants being given fertilizer A. Two weeks after planting, Manuel measures the tomato plants and discovers that the tomato plants given fertilizer A have grown much more rapidly than the tomato plants being given fertilizer B. Manuel's resultsA. are not valid because one of the variables was not controlled during week 2.

B. are valid because he controlled all of the variables in week 1.

C. are valid because he designed his experiment correctly.

D. are not valid because he should not have grown the plants in identical environments.

If a lab experiment is not complete, you should​

Using the first initial of each word in the Word Bank, list the order of the levels of classification, starting with the broadest category. In your answer, do not put a space or any character between each letter (example: EBACD). Word bank
C Class
D Domain
F Family
G Genus
K Kingdom
O Order
P Phylum
S Species

Which statements accurately describe the roles of decomposers in the carbon cycle? Select three options. Decomposers release carbon dioxide into the air as waste. Decomposers remove carbon dioxide from the air during photosynthesis. Decomposers break down the remains of dead plants and animals. Decomposers return carbon compounds to the soil. Decomposers use carbon to make food molecules.

Three common STIs that sexually active people can contract

Choose all the answers that apply.Which of the following increases erosion?
clearing forests
leaving fields unplanted
careless farming
contour plowing
crop rotation
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Contour plowing occurs when:
farmers plow fields in horizontal rows
farmers stop plowing fields
farmers plow fields around hills
farmers plow fields around brooks and steams

All of the following bring Carbon into the ocean except A. Positive ions

B. Photosynthesis

C. Decaying organisms

D. The gases in the atmosphere