What does suggest mean in science class?

Answer 1

Here's an educated guess. It means that a body of evidence apparently supports a hypothesis, but more and stronger evidence is needed before the hypothesis can be taken seriously. The evidence that suggests the validity of the hypothesis may even be anecdotal, or general untested 'knowledge', or informally gathered. Some experimentation has to be done to try to refute the hypothesis. You would not want to put a lot of weight on the assumption that the hypothesis is absolutely true until you have exhausted, to the best of your ability, the possibility that it is false.