Which of the following is not true about nonnative species? a. They can have positive impacts on an ecosystem. b. They can have negative impacts on an ecosystem. c. They can be introduced within their natural range. d. A nonnative species can be an invasive species. Please select the best answer from the choices provided A B C D

C). They can be introduced within their natural range.

Explanation:

Non-native species are described as the species that are introduced or occurred outside their natural range which could be a different region or country. It primarily involves 'exotic' species.

As per the question, the third statement i.e. 'they can be introduced within their natural range' is false regarding non-native species as the very name implies that they are introduced outside or apart from their natural range. The other statements are true as non-native species may have positive as well as negative effects(which includes invasion also) on the ecosystem. They offer certain economic advantages and also help in rescuing or protecting the native species while at the same time pose a threat to them due to having certain selective advantages like quicker growth, more impactful dispersal etc. Thus, option C is the correct answer.

each year on this day, i make it a point to listen to dr. martin luther king jr.’s great “i have a dream” speech. it’s electrifying every single time.

the content of dr. king’s speech, his inspiring presence, and the moment in history all came together to make the iconic “i have a dream” speech the defining moment of the american civil rights movement. but there are several other reasons why this speech, delivered over 50 years ago, remains an example of one of the best speeches in american history.

since part of my job is to people become better presenters, i’ve noticed several techniques that we can all learn from and be inspired by in this magnificent speech.

it’s anchored in a powerful related location

in most cases, you can’t handpick the spot to give a presentation, as mlk did for supreme symbolic effect when he stood on the steps of the lincoln memorial and echoed the opening words of the gettysburg address (“five score years ago . . ). but you absolutely can amplify your message by adapting it to your setting and location.