Stem cells have the capacity to regenerate, and some can even regenerate into almost any type of cell. stem cell research is a
relatively new science that can be used to recreate organs such as livers or that would give many terminally ill people a chance to
survive. what is one disadvantage of stem cell research?
a.)the long-term effects of stem cells are completely unknown.
b.)invasive surgery is required to extract organs grown with stem cells.
c.)we cannot control which organs stem cells will develop into
d.)stem cells have no practical application to regenerative medicine.

In a classic experiment using pea shape, mendel conducted two separate genetic crosses. in the first cross the parent plants were “true breeding” for pea shape; one had round peas ( r )and the other had wrinkled (r). the first cross produced a filial 1 generation of all round peas. in the second cross, mendel bred plants from the filial 1 generation. this cross produced different results. out of approximately 1000 plants, about 75% were round and 25% were wrinkled.

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.