A(n) ____________ ____________ is a physical or biological ...

[jasdeep_brar]

A(n) ____________ ____________ is a physical or biological necessity whose presence in inappropriate amounts
  limits the normal action of an organism. Fill in the blank(s) with the appropriate word(s).

Question 2

The carbon and nitrogen cycles are the largest of all the ____________ cycles. Fill in the blank(s) with the appropriate word(s).

[shaikhs]

Answer to Question 1

limiting factor

Answer to Question 2

biogeochemical

[jasdeep_brar]

Thanks for the timely response, appreciate it

[sailorcrescent]

Gracias!