In order for gas to leave a planet it needs to be hot enough and to overcome the planets gravity. The outer planets are colder and are very big compared to earth.
I think I’ll go with C. long dry cold winters
Parasitic.
you need to know each of these choices meaning so that it will be easier to solve such a problem.
parasitic means it consumes its host and leave it only exhausted adn maybe dead.
autotrophic is like plants, they can make their own food.
saprophytic means is called on an organism, especially fungi, that feeds on dead material only.
