Which are statements that are true about ecosystems? The health of an ecosystem is sometimes improved by human activities.
Your backyard is an ecosystem.
The sun is the primary source of energy in an ecosystem.
Hunters have a part in balancing the earth's ecosystems.
In a healthy ecosystem, the removal of one organism will have little effect on the rest of the ecosystem.
Producers return nutrients to the soil.

Anstobacco uses;  

Intrusion is the best answer and the newest form.

Are there choices? it would really me you me to answer this question : ). if not then here is a list of rivers that i got online, i will leave a link so that it isn't copyright : ). irrawaddy river, salween river, chao phraya, mekong, and read rivers.   and here is the link: if this , let me know, and mark brainliest, s much : )dear i hope this is not against your rules, i am just trying to my good friend billystofan : )