Given a scientific question, generate a correct answer to it.

Input: Consider Input: Giardiasis and malaria are diseases caused by what organism?

Output: protozoa

Input: Consider Input: What is the outer layer of an axon that acts like a layer of insulation, similar to the plastic that encases an electrical cord?

Output: myelin sheath

Input: Consider Input: Helicopter pilots can recover from piloting errors by decreasing altitude, turning some of their potential energy into what kind of energy?
Output: kinetic