The long and hard hairs, located upon the upper lip in rabbit are especially meant for

Correct Answer: D

Rationale: The long and hard hairs on a rabbit's upper lip, known as whiskers, serve multiple purposes. Firstly, they provide tactile stimulation by helping the rabbit sense its surroundings. Secondly, they aid in pressure stimulation, helping the rabbit navigate through tight spaces. Finally, they play a role in temperature stimulation by detecting changes in the environment. Therefore, the correct answer is D, "All of the above," as whiskers serve all these functions. Choices A, B, and C are incorrect because they each represent only one aspect of the whiskers' function, while the correct answer encompasses all of them.

Correct Answer: C

Rationale: Rationale: Taxidermy involves preserving the whole skin (epidermis and dermis) using chemicals to maintain the lifelike appearance of an animal. Albinism is a genetic condition causing lack of pigmentation. Toxicology is the study of the adverse effects of chemicals on living organisms. Tanning is a process of treating animal hides to produce leather, not preserving the whole skin.

Correct Answer: D

Rationale: The correct answer is D: Stratum corneum of the skin. Nails, claws, horns, and hooves in mammals are produced by keratinized structures in the epidermis called the stratum corneum. This specialized layer of the skin is responsible for forming these protective structures. Cartilage (A) is not involved in the production of these structures. Bone (B) is part of the skeletal system and not directly responsible for the formation of nails, claws, horns, or hooves. Muscles of the skin (C) are involved in movement and expression but do not produce these particular structures. Therefore, the correct answer is D as it directly relates to the formation of nails, claws, horns, and hooves in mammals.

Correct Answer: D

Rationale: The correct answer is D because in mammals, scent glands can be modified sudorific (sweat) glands and sebaceous (oil) glands. Sudorific glands produce sweat that can carry scent, while sebaceous glands secrete oily substances that can also contribute to scent communication. Mucous glands, as mentioned in option C, are not typically involved in scent production in mammals. Option A and B individually are not comprehensive enough to cover all types of scent gland modifications found in mammals. Thus, the correct answer is D as it includes both sudorific and sebaceous glands, which are commonly modified for scent production in mammals.

Correct Answer: B

Rationale: The correct answer is B: Stratum lucidum. Eleidin is a protein-rich substance found in the stratum lucidum, the clear layer of the epidermis located between the stratum corneum and stratum granulosum. This layer is characterized by its translucent appearance due to the presence of eleidin, which helps to provide waterproofing and protection to the skin. The stratum germinativum (A) is responsible for cell proliferation, the stratum granulosum (C) is where keratinocytes undergo apoptosis, and the stratum corneum (D) consists of dead keratinocytes and serves as a barrier to external factors.