Answer:
You can buy tiny sealed marine ecosystems enclosed in glass. ... like the one in your bottle, you will need to establish an ecological balance in order for all of ... if you have too many animals consuming oxygen and not enough plants ... Water is consumed by both plants and animals, but is also excreted, purified, and reused.
Explanation:
Answer:
list of three devices are 1st phone 2nd doorbell 3rd alarm clock
Explanation:
if these devices will not produce sound then we can not do our work properly these are very useful for everyday life