When doing medical research with human subjects, which four limitations are unavoidable? A.)It’s often impossible to repeat trials on the same subjects.
B.)Subjects may report an inaccurate medical history.
C.)It can be difficult to control all possible variables.
D.)It’s impossible to come up with testable scientific questions for human subjects.
E.)There are ethical or privacy concerns to consider.

What are the probable phenotypes of their offspring

What type of cell is produced after fertilization occurs and the gametes combines ?

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.