Answer:
When conducting research, scientists use the scientific method to collect
measurable, empirical evidence in an experiment related to a hypothesis (often in
the form of an if/then statement), the results aiming to support or contradict a
theory.
<span>d. by sending and detecting chemical messages</span>
<span>Pleural sac is a two
layered membrane formed when a serous membrane known as pleura folds back onto
itself. Thus, the pleura invest the lungs and line the walls of the thoracic
cavity. However, the potential volume of the thoracic cavity increases during
inhalation.</span>
Answer:
The answer is B, extensive research of an individual organism over many years.
Explanation:
The question is asking, what best describes Darwin's studies that led to the theory of evolution, it would be a lot of research over a long period of time. Think, if you were to do a school project, would you get your best results over a short or long period of time with little or a lot of evidence/research? So, B is the best answer, I believe.
(PLEASE BRAINLIEST)
D. In a structure of the female reproductive system.
