Two drugs were tested to see whether they helped women with breast cancer. Of 1060 women, about half were randomly assigned to drug A and the other half were assigned to drug B. After 77 months, 473 out of 539, and 426 out of 521 women assigned to drugs A and B, respectively, were alive. Complete parts (a) and (b) below.

a. The survival rate for drug A is %. The survival rate for drug B is %. The survival rate for drug A is (1) the survival rate for drug
B. (Round to one decimal place as needed.) Was this a controlled experiment or an observational study? Explain why. From studies like these, can we conclude a cause-and-effect relationship between the drug type and the survival percentage? Why or Why not?
A. This is a controlled experiment because the researchers randomly determined the groups. Subjects are pre-screened for genetic factors that make it more likely that an experimental drug will be effective. All genetic confounding factors have been controlled for, which is essential to conducting a controlled experiment.
B. This is an observational study because the subjects determined the groups. The sample size is not sufficiently large to capture the variable effects of breast cancer. This feature is essential to conducting a controlled experiment.
C. This is an observational study because the subjects determined the groups. The researchers did not assign a placebo to any women, which is essential to conducting a controlled experiment.
D. This is a controlled experiment because the researchers randomly determined the groups. We can conclude a cause-and-effect relationship because the women were randomly assigned to the treatment and control groups, which controls for other variables lower than higher than equal to

First to answer all gets a donation question 3(multiple choice worth 1 points) (04.01 lc) which of the following levels is lower than cells in the hierarchy of organization of living things? molecules organs organ systems tissues question 4(multiple choice worth 1 points) (04.01 lc) which of these represents an individual form of life such as an animal, plant, or single-celled life form? organ organism organ system tissue question 5(multiple choice worth 1 points) (04.03 lc) what are the green structures inside plant cells where photosynthesis takes place called? chloroplast mitochondrion nucleus vacuole question 6(multiple choice worth 1 points) (04.03 lc) which of the following best matches a part of a living cell with the function it performs? cytoplasm: fluid which carries the nucleus and other organelles vacuole: fluid which carries the nucleus and other organelles cytoplasm: directs all of the cell's activities vacuole: directs all of the cell's activities question 7(multiple choice worth 1 points) (04.03 mc) read the table below. organelles of plant cells present in both plants and animals present in plants but not animals small in animals but large in plants organelle a organelle b organelle c which statement is most likely correct? organelle a is chloroplast, organelle b is cytoplasm, and organelle c is nucleus. organelle a is mitochondrion, organelle b is cytoplasm, and organelle c is nucleus. organelle a is cell wall, organelle b is chloroplast, and organelle c is mitochondrion. organelle a is mitochondrion, organelle b is chloroplast, and organelle c is vacuole. question 8(multiple choice worth 1 points) (04.03 mc) what will most likely happen in the absence of a nucleus? genetic information will not be transmitted by the cell. energy will not be released during cellular respiration. the cell will not store food, water, nutrients, and waste. the cell will lose its shape and structure.

Two rectangular prisms have the same volume. the area of the base of the blue prism is 418 4 1 8 square units. the area of the base of the red prism is one-half that of the blue prism. which statement is true?

Which numbers have the same absolute value? choose all that apply. asap will mark at brainliest