Correct Answer: C

Rationale: In females, the twenty-third pair of chromosomes is indeed labeled as XX. This pair of chromosomes determines the biological sex of females. Choice A, 'an autosome,' is incorrect as autosomes refer to the non-sex chromosomes. Choice B, 'dizygotic,' is incorrect as it relates to twins. Choice D, 'XY,' is incorrect as it represents the chromosome pair found in males.

Correct Answer: C

Rationale: Erikson's theory of psychosocial development highlights generativity as the central focus of middle adulthood. Generativity involves being productive, caring for others, and contributing to society. This stage is characterized by a desire to leave a lasting impact on future generations. Choices A, B, and D are incorrect. Initiative is associated with the preschool years, autonomy with early childhood, and industry with middle childhood according to Erikson's stages of development.

Correct Answer: B

Rationale: The correct answer is 'Successful.' Successful aging encompasses achieving desirable outcomes and coping effectively with life's challenges and losses. 'Optimal' could imply a focus solely on achieving the best outcomes without considering challenges and losses. 'Peerless' means unmatched or unrivaled, which does not address coping with challenges. 'Capital' is related to wealth or assets and is not suitable in the context of aging and coping with life's difficulties.

Correct Answer: D

Rationale: According to the lifespan perspective, no single period is considered supreme in its impact on the life course. Each stage of life, from prenatal period through adulthood, plays a significant role in shaping an individual's development. Therefore, the correct answer is 'D: no age period.' Choices A, B, and C are incorrect because the lifespan perspective emphasizes that all stages are important and contribute uniquely to an individual's life course.

Correct Answer: A

Rationale: Correct answer: Developmental science is interdisciplinary because it integrates knowledge from multiple fields like psychology, biology, and sociology. The term 'empirical' refers to information gained from observation or experimentation, which is not the focus of this question. 'Applied' and 'theoretical' do not capture the essence of developmental science requiring inputs from various disciplines.