[a] if a tightly scaled syringe containing 20 cubic centimetre of air is placed in hot water for some time and then removed what will happen to the volume of air when the syringe is placed in hot water? [ii]explain your answer in terms of particle arrangement and temperature change [iii]name the process described by the change above [b] what will happen to the volume of air after the syringe is removed hot water? [i]explain your answer in terms of particle arrangement and temperature change [ii]name the process described by the change above

Which of the following is an example of an environmental change the affected the evolution of life a. volcanic activity b. changes in climate c. mountain building d. all 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.

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna