The fossil record indicates that a number of large animal species ...

[danielfitts88]

The fossil record indicates that a number of large animal species became extinct as humans arrived on
  continents and islands. For example, the moa, a giant bird that once lived on New Zealand, was wiped out by
  arriving Polynesians in the 1300s
  An antonym for extinct is
 
  a. alive
  b. dead
  c. near death
  d. endangered

Question 2

Fragile ecosystems like mangroves are being replaced by fish farms, which are projected to provide most of
  the fish we consume within 20 years.
  A synonym for ecosystems is
 
  a. forests
  b. meadows
  c. man-made environments
  d. ecological communities

[diesoon]

Answer to Question 1

a. alive

Answer to Question 2

d. ecological communities

[danielfitts88]

Thanks for the timely response, appreciate it

[tranoy]

Gracias!