instruction:
Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.
question:
Question: What type of cell layer do flatworms have? Answer: mesoderm
answer:
Flatworms have a mesoderm cell layer and simple organ systems. They also show cephalization and bilateral symmetry.

question:
Question: Which kind of flowers carry both male and female floral organs? Answer: perfect flowers
answer:
Figure 14.25 This image depicts the structure of a perfect and complete flower. Perfect flowers carry both male and female floral organs. (credit: modification of work by Mariana Ruiz Villareal).

question:
Question: What are the four stages of food processing? Answer: ingestion, digestion, absorption, and elimination
answer:
41.2 The main stages of food processing are ingestion, digestion, absorption, and elimination.