Final answer:
The jobs of the Growth Cone include guiding axons, determining growth direction, and exploring the extracellular environment. It's involved in developing the nervous system. Dendrites have dendritic spines that increase synaptic connections, and the myelin sheath insulates axons, not dendrites.
Step-by-step explanation:
The correct answer to the question regarding the jobs of the Growth Cone in neuron development is D. all of the above are jobs. The growth cone plays a fundamental role in the nervous system's development by guiding axons, determining the direction of growth, and exploring the extracellular environment to direct where the axon should grow next. Growth cones are dynamic structures at the tips of axons consisting of lamellipodia and filopodia which detect chemical and physical cues in their surroundings that help navigate the growing axon to its synaptic target.
It's important to clarify that while the myelin sheath does serve as insulation, it predominantly wraps around axons, not dendrites. Neurons contain dendrites to receive signals, and each neuron can have multiple dendrites. Dendrites can have structures called dendritic spines which actually increase the number of possible synaptic connections.