A positive point charge q sits at the center of a hollow spherical shell. The shell, with radius r and negligible thickness, has net charge −2q

Which statements are true for invasive species? 1. they always stabilize an ecosystem. 2. they’re always successful in adjusting to a new habitat. 3. they often compete with the native species for resources. 4. they have the ability to displace the native species. 5. they’re always pests.