The process by which an egg cell and a sperm cell fuse to form a zygote is known as:

Correct Answer: C

Rationale: Fertilization unites egg and sperm into a zygote, launching development. Unlike division or diffusion, it's the reproductive spark. Clinicians monitor this in fertility, ensuring successful conception initiates life's cellular journey.

Correct Answer: B

Rationale: The cell is the basic unit of life, capable of all life processes (e.g., metabolism), unlike atoms (A, non-living), organs (C, multiple tissues), or tissues (D, cell groups). From single-celled organisms like bacteria to human neurons, cells are anatomy's starting point, housing organelles that sustain life, making B the clear answer.

Correct Answer: B

Rationale: Anatomical position is standing erect, arms at sides, toes forward, with palms facing forward (supinated), not backward. This standard posture ensures consistent directional terms like anterior across anatomy, and B's deviation (pronation) misaligns with this convention.

Correct Answer: D

Rationale: Proximal means closer to a limb's attachment (e.g., elbow to shoulder), unlike anterior (A, front), distal (B, farther), or medial (C, midline). In anatomy, this term maps limb structures, vital for describing positions like the proximal femur near the hip.

Correct Answer: A

Rationale: Ipsilateral means same side (e.g., right arm and leg), unlike anterior (B, front), contralateral (C, opposite side), or peripheral (D, outer). This anatomical term aids in mapping unilateral relationships, critical for clinical descriptions like nerve pathways.