What are the 2 primary agents of cellular communication?

Leila has dimples because she received a gene copy from her father that coded for dimples. this means that dimples are an example of a trait that is

1. describe the structure and function of the specialized cells you observed in the video. 2. research the types of cells present in the kidney.

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.