Mr. Bossman, a supervisor at a manufacturing company, recently attended a professional conference and heard of a special energy drink that is reported to increase the productivity of factory workers. Mr. Bossman wanted to know if the claim was valid. He created two groups of 100 workers each and gave them the task of putting together a small control device his company manufactures. The workers were already familiar with the task, so it was not necessary to teach the task before beginning. Group #1 was given the energy drink before the task and Group #2 was not given the drink. Mr. Bossman then had his trusted assistant, Jane, count how many correctly assembled devices each group produced in the allotted time. Group #1 assembled 182 devices and Group #2 assembled 271 devices. a. Identify the following:
Independent variable: Dependent variable:

Name at least two standardized (constant) variables:

b. Which group would be the control group? Why is it necessary to have a control group?

c. What conclusion could Mr. Bossman reach based on the results of this experiment?

d. Give at least two ways this experiment could be improved.

Rease is an enzyme used by plants to break down urea (a nitrogen-containing compound) into carbon dioxide and ammonia. urease urea > > > carbon dioxide and ammonia ammonia is broken down by plants into a nitrogen source plants need to grow. thus, plants could not use urea as a nitrogen source unless it was first converted to ammonia. in soybean plants there are two different kinds of urease, one produced in the seeds and the other produced in the leaves of the plant. three types of soybean plants were used in a set of experiments: normal soybeans and two mutant strains, one lacking the urease in the seeds only (strain 1) and one lacking urease in the leaves only (strain 2). experiment 1 separate areas in a field were planted with normal, strain 1, and strain 2 soybeans. all types of soybeans appeared to grow, flower, and produce seeds equally well. there were no externally detectable differences among the strains. experiment 2 small pieces of plant leaves of equal weight were obtained from each type of soybean plant and separately placed on media in culture dishes. tissue growing in this way will become an unorganized clump of cells referred to as callus. to provide a controlled nitrogen source, half the tissue samples of each type were placed on media containing urea, and the other half of the samples were placed on media containing ammonia. after 30 days, the weight gain for each of the callus samples was determined. results are shown in the table below.

The green colored pigment in chloroplasts is? a. nitrogen b. chlorophyll c. chlorophorm d. chlorofloromethane

The body of water found at number 4 on the map above is the