Answer:
In biology, symbiotic nitrogen-fixing bacteria invade the root hairs of host plants where increment or multiply and stimulate formation of root nodules, enlargements of plant cells and bacteria in intimate association. The bacteria that change nitrogen gas from the atmosphere into solid nitrogen usable by plants are called nitrogen-fixing bacteria. These bacteria are found both in the soil and in symbiotic relationship with plants.
Explanation:
Are you asking for the definitions?
I believe the answer should be B) rehabilitation exercises so,
After you have rested an injured body part, the next step should be rehabilitation exercises.
Answer:
C. Systemic arterioles respond to a decrease in PO₂ by dilating, but pulmonary arterioles constrict in response to decreased PO₂.
Explanation:
In the arterioles, vasoconstriction is a response to high oxygen while vasodilation is a response to carbon dioxide and low pH. However, in the pulmonary arterioles, vasoconstriction occurs as a response to low oxygen and this mechanism is called hypoxic pulmonary vasoconstriction (HPV).
