Biology

The lacrimal glands are responsible for secreting tears, which help lubricate and protect the surface of the eyes. The other glands listed do not produce tears.

The average resting heart rate for a normal adult male is typically around 70 beats per minute, which is within the normal range of 60 to 100 bpm.

The normal body temperature of a healthy adult human is approximately 37.0 °C. Other options are either too high or too low to be physiologically normal.

Leukemia is a type of cancer that affects the blood and bone marrow, characterized by the overproduction of abnormal white blood cells. Therefore, the correct answer is 'Blood'.

The medulla oblongata is a part of the human brainstem that controls vital autonomic functions such as breathing and heart rate. Therefore, it is correctly identified as part of the brain.

The cerebrum is the largest part of the human brain, responsible for higher brain functions such as thought and action. The medulla oblongata and cerebellum are smaller parts involved in autonomic functions and coordination, respectively.

The beautiful color patterns in a peacock's tail feathers arise due to interference of light caused by microscopic structures in the feathers, not selective absorption or reflection. This structural coloration results in iridescent colors.

Trachoma is a contagious bacterial infection that primarily affects the eyes, specifically the conjunctiva and cornea, leading to blindness if untreated.

A predator is an animal that captures and kills other living animals for food, which matches the definition given in the question. Parasites live on or in a host without killing it immediately, scavengers feed on dead animals, and mammals are a class of animals, not defined by feeding behavior.

The tibia is one of the two long bones in the lower leg, commonly known as the shinbone. It is not found in the skull, arm, or face, making 'Leg' the correct answer.