During photosynthesis, water molecules are split and __________ is released into the atmosphere and used by living organisms for respiration.
A. oxygen
B. nitrogen
C. carbon
D. phosphorus
Which statement about populations is true?
A. Populations are larger than communities.
B. Populations consist of biotic and abiotic factors.
C. Populations can increase or decrease with seasons.
D. Populations consist of only the animals in an ecosystem
Nitrogen gas makes up _____ of the air in the atmosphere.
A. 11%
B. 24%
C. 46%
D. 78%

Question

During photosynthesis, water molecules are split and __________ is released into the atmosphere and used by living organisms for respiration. 
	A.	oxygen
	B.	nitrogen
	C.	carbon
	D.	phosphorus
  Which statement about populations is true? 
	A.	Populations are larger than communities.
	B.	Populations consist of biotic and abiotic factors.
	C.	Populations can increase or decrease with seasons.
	D.	Populations consist of only the animals in an ecosystem  
Nitrogen gas makes up _____ of the air in the atmosphere. 
	A.	11%
	B.	24%
	C.	46%
	D.	78%

anonymous · Answer

The answers, in order, are A, A, D.

anonymous · Answer

My bad, the second one is actually C, because some animals might migrate during the seasons.