Explain the significance of oxygen to animals? A. Animals use oxygen to help circulate blood in the body.
B. Animals use oxygen to digest food.
C. Animals use oxygen to convert food to energy through photosynthesis.
D. Animals use oxygen to convert food to energy through respiration.
please answer asap its for a test

Refer to the family pedigree shown here. in generation i, one parent is affected by the gene mutation and one parent isn't. in generation ii, all three children are affected by the gene mutation. what can you conclude about this gene mutation? a. all children born in future generations will be affected by this disorder. b. this gene mutation is a dominant disorder. c. this gene mutation is a recessive disorder. d. the generation i mother is a carrier of this gene mutation.