There are a lot of different and complex ways that invertebrates care for their young, which makes it hard to say how this behavior evolved in the first place. However, there are a few ideas about factors that influence parental care in different species. One important factor is the environment the invertebrates raise their young in. First, parental care is really important for animals that live in harsh environments, like in a desert, where eggs or young cannot easily survive without the help of their parents. Second, when food is scarce and only around for a short time, there can be lots of competition for it. In this case, young animals need their parents' help to get enough food. Last, parents may need to guard their offspring from predators that want to eat them.
Another important factor influencing parental car is the number of offspring that survive when parents are around vs. when parents are not. The number of surviving young influences how many copies of the parents' genes are passed on to the next generation.

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