People are biological creatures as well as rational human beings. In order to gain a complete understanding of any aspect of human behavior, the field of anthropology adopts what strategy?
1. ethnobiology
2. a four-field approach
3. cultural evolution
4. physical anthropology

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.

The mixture of sperm and fluids from the seminal vesicles, prostate gland, and cowper's glands is called

During the process of blank and molecules such as a glucose must use a protein channel to cross through a cell membrane