A greenhouse is building where plants can be grown. It has walls that allow light and air inside. The amount of water and nutrients the plants receive can be controlled. Which is the best way for a farmer to make a greenhouse a good model for testing how crops will grow in a large field?

A)He could remove the walls of the greenhouse.

B) He could put windows around the field to make it like the greenhouse.

C)He could recreate the soil and water conditions of the field in the greenhouse.

D)He could place tiny models of farm equipment in the greenhouse.

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.

The human genome project is devoted to mapping the general dna sequence of our species. this could lead to the development of new medicines, as well as the possibility of using gene therapy to treat certain diseases. however, there are some ethical issues surrounding the mapping of individual genomes. one concern is a) that your genes may change over time, making the project useless. b) that insurance companies could discriminate based on genetic make-up. c) that since this has never been done before, we should probably not do it now. d) that sequencing our individual genomes is so expensive, it is a counter-productive strategy.