SECTION A Questions 31-40 (Ten questions) Directions: Each question consists of four lettered headings A, B, C, D. Select the heading which is closely related to the description which follows.

Here are the solutions to the questions, with the requested formatting:

31. The process that releases carbon dioxide into the atmosphere is respiration.

• C) Respiration $$\boxed{\text{C) Respiration}}$$

32. The cerebellum is responsible for controlling balance and posture.

• B) Cerebellum $$\boxed{\text{B) Cerebellum}}$$

33. A pair of non-identical genes (alleles) for the same characteristic describes a heterozygous genotype.

• D) Heterozygous $$\boxed{\text{D) Heterozygous}}$$

34. An association between two organisms in which both benefit is called mutualism.

• C) Mutualism $$\boxed{\text{C) Mutualism}}$$

35. A natural self-sustaining unit, consisting of living organisms and their non-living environment, is an ecosystem.

• D) Ecosystem $$$$