What are some of the adaptations that the integumentary system has evolved to help organisms survive in different environments?

Correct Answer: D

Rationale: The correct answer is D because the integumentary system has evolved various adaptations to help organisms survive in different environments. A is correct as thick fur or feathers help retain heat in cold climates. B is correct as thick skin helps prevent water loss in desert climates. C is correct as scales or fins protect aquatic animal skin. Therefore, D encompasses all these adaptations, making it the correct choice.

Correct Answer: A

Rationale: The correct answer is A: Skin. The integumentary system consists of the skin, which includes the epidermis, dermis, and hypodermis. The epidermis is the outermost layer of the skin, providing protection and regulating temperature. Choice B (Skin and skin derivatives) is incorrect as the epidermis itself is considered part of the skin, not a derivative. Choice C (Skin and cutaneous gland) and choice D (Skin and hairs) are also incorrect as they are specific structures or components of the skin, not the entire integumentary system. The term "skin" encompasses all layers and structures that make up the integumentary system, making choice A the most appropriate answer.

Correct Answer: B

Rationale: The correct answer is B: Stratum granulosum. This layer of the epidermis contains granules of keratohyaline protein, which play a crucial role in the formation of keratin. Keratohyaline granules help bind keratin filaments together, leading to the development of a tough, protective barrier in the skin. A: Stratum malpighi is not the correct choice as it refers to the combination of the stratum basale and stratum spinosum layers of the epidermis, which do not contain keratohyaline granules. C: Stratum lucidum is not the correct choice as it is a thin, translucent layer found only in certain areas of the skin, such as the palms and soles, and does not contain keratohyaline granules. D: Stratum corneum is not the correct choice as it is the outermost layer of the epidermis composed of dead, ker

Correct Answer: A

Rationale: The correct answer is A because if dead cells of the stratum corneum are alive, it means the skin barrier is compromised, allowing bacteria to penetrate the skin and enter the body, leading to potential infections and health risks. Choice B is incorrect because the growth of hairs is unrelated to the status of the stratum corneum. Choice C is incorrect as the secretion of sweat is not directly affected by the condition of the stratum corneum. Choice D is incorrect because bacteria developing on the skin is a common occurrence, regardless of the state of the stratum corneum.

Correct Answer: A

Rationale: The correct answer is A: Epidermis. In rabbits, hairs and most glands are developed from the epidermis, the outermost layer of the skin. The epidermis contains specialized cells that differentiate into hair follicles and various glands. The dermis (choice B) is the layer beneath the epidermis, primarily consisting of connective tissue. The subcutaneous layer (choice C) is primarily made of fat cells and helps insulate the body. The reticular layer (choice D) is part of the dermis and provides structural support. Therefore, the epidermis is the correct choice as it is the primary source of hair and gland development in rabbits.