[General] Ponds are noted for

[atabitaraf]

In this test, there is an error I'm supposed to find. But I doubt one of these options: 1. 'varied' can be replaced with 'varying'. 2. 'life' can be replaced with 'lives'.

Ponds are noted for their rich and varied types of plant and animal life, all maintain in a delicate ecological balance.

 

[Rover_KE]

Sorry, neither of those is the error.

Try again.

 

[atabitaraf]

I really couldn't find it. It gives me a headache.

 

[emsr2d2]

Look at the part after the comma.

 

[atabitaraf]

Balance mustn't be countable here. Is that it? 'a' is extra.

 

[emsr2d2]

Both "a" and "balance" are correct. Look at the second and third words of the second clause.

 

[atabitaraf]

Both "a" and "balance" are correct. Look at the second and third words of the second clause.

I finally couldn't find the error in here. :-(
What's the problem with maintain in? Beats me.

 

[Rover_KE]

It should be 'maintained'.