If the position of a body is not changing with respect to a given frame of reference, the body is said to be at rest, motionless, immobile, stationary, or to have constant (time-invariant) position. An object's motion cannot change unless it is acted upon by a force, as described.
Giardia in Humans. Giardia is a microscopic parasite responsible for the diarrhea-related illness giardiasis. Also known as Giardia intestinalis or Giardia lamblia, this organism begins to multiply within the intestines after a person becomes infected.For more details on symptoms of giardiasis, treatment options, and different ways in which humans can become infected with this parasite, click Giardia.).
Giardiasis (gee-ar-die-a-sis with a soft G) is an infection of the small intestine that is caused by the parasite, Giardia intestinalis, also known as Giardia lamblia.rophozoites are important not only because they cause the symptoms of giardiasis, but also because they produce the cysts that exit the body in the feces and spread the infection to others. Cysts of Giardia are present in the feces of infected persons.