Question

part a which is a central idea of the text? ancient lakes are critical to the tourism industry, so the industry is leading the fight to save them from losing their biodiversity. humans need to limit their interactions with ancient lakes, or they will disappear entirely. there will be a loss of biodiversity in ancient lakes unless scientists can figure out how to add the right nutrients to the water. ancient lakes are important historically, biologically, and economically, but they face many threats.

Explanation:

The text mentions the historical importance (being over 10,000 years old), biological value (containing diverse life - forms), and economic significance (related to tourism and research) of ancient lakes, as well as threats like human presence and environmental changes.

Answer:

D. Ancient lakes are important historically, biologically, and economically, but they face many threats.