Answer:
Possible environmental contamination.
Explanation:
These unsegmented worms have a full digestive system even when parasitic.
The moon has a higher maximum surface temperature compared to Earth (253 degrees of moon to 136 degrees of Earth), but this also depends on night (which is colder) or day (which is hotter).
The moon has such extreme temperatures because it has no atmosphere that can "reflect" some of the heat from the sun, whereas the earth does.
The answer is “Variation that decrease reproductive success are more likely to be passed on.”
Cell wall and Chloroplast
