The head begins to take shape in the ______ week after conception
fourth
fifth
sixth
seventh
fourth
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The cells that provide support and nourishment for the cells that communicate in the nervous system are called ____________________
Fill in the blank(s) with correct word
Cosella is conducting an experiment where she assesses how quickly teenagers can run a 100-meter race after consuming specific amounts of caffeine. She divides her sample up into three groups. Group 1 receives a glass of water with no caffeine added. Group 2 receives a glass of water with an amount of caffeine equivalent to that in one cup of coffee. Group 3 receives a glass of water with an
amount of caffeine equivalent to that in two cups of coffee. Each participant is then timed as they run the course. In this study, the independent variable is a. the previous running experience of each participant. b. the teenagers who are being studied. c. the time it takes to run the 100-meter race. d. the amount of caffeine being ingested.
Which of the following is likely to be found in a study debriefing?
A. warnings of potential study dangers B. a survey about the research experience C. citations from research used to develop the hypothesis D. details on how participants may skip questions with which they are uncomfortable
As we age,
A) the epidermis becomes more firmly attached to the dermis. B) fibers in the dermis thicken. C) fat in the hypodermis increases. D) cells in both the epidermis and dermis decline in water content.