Dreissena polymorpha is: 1. A nonnative species
2. A keystone species
3. An indicator species

The nervous system is responsible for our fight-or-flight response.a.autonomicb.parasympatheticc.somaticd.sympathetic  select the best answer from the choices providedabcd

The sun a. will become a red giant within two to three million years b. is in its main sequence, which willlast thousands of years c. is in its main sequence, which will last billions of years. d. will explode as a supernova after its main sequence

Which tip applies to the aspire test and psat equally