Practice 5: Match each relationship description to the correct corresponding relationship. Mutualism
Both organisms benefit
Predation
Both organisms are harmed in some way
Parasitism
One organism benefits and the other is neither
harmed nor benefits
Competition
One organism eats the other living organism
Commensalism
One organism lives on and takes resources from a host
organism

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

the correct answer is b

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.