A Reproductive Difference Between Sea Urchins and Humans Is ________

question 62

Multiple Choice

A reproductive difference between sea urchins and humans is ________.

• A) the sea urchin egg completes meiosis prior to fertilization, but meiosis in humans is completed after fertilization
• B) sea urchin eggs and sperm are of equal size, but human eggs are much bigger than human sperm
• C) sea urchins, but not humans, have a need to block polyspermy, because only in sea urchins can there be more than one source of sperm to fertilize the eggs
• D) sea urchin zygotes get their mitochondria from the sperm, but human zygotes get their mitochondria from the egg

---

Definitions:

Medulla

often refers to the medulla oblongata, which is the lower half of the brainstem, playing a crucial role in transmitting signals between the brain and the spinal cord, and in controlling autonomic activities such as heartbeat and breathing.

Pons

A portion of the brain stem that plays a pivotal role in regulating vital functions such as breathing, communication between different parts of the brain, and sensations like hearing.

Longitudinal Fissure

The deep groove that separates the two hemispheres of the vertebrate brain.

Forebrain

The anterior part of the brain, including the cerebral hemispheres, thalamus, and hypothalamus, responsible for complex cognitive, sensory, and motor functions.