Question

any substance, whether in elemental or molecular form, that must be provided to an organism is called a(n)
ionic nutrient.
essential nutrient.
micronutrient.
trace element.
question 2 (1 point) ✓ saved
a micronutrient can also be called
a trace element.
a macronutrient.
an elemental reservoir.
a principal nutrient.
question 3 (1 point) ✓ saved
an organism that is capable of living without oxygen if necessary is termed a(n)
aerobe.
facultative anaerobe.
obligate anaerobe.
aerotolerant anaerobe.
aerobic

Explanation:

• For the first question: An essential nutrient is a substance that an organism must obtain from its environment. Ionic nutrients refer to nutrients in ionic form. Micronutrients are needed in small amounts. Trace elements are also in small amounts but usually refer to elements.
• For the second question: Micronutrients (needed in small amounts) are also called trace elements. Macronutrients are needed in large amounts. An elemental reservoir is not the same as a micronutrient. A principal nutrient is a main nutrient (more like a macronutrient concept).
• For the third question: A facultative anaerobe can live with or without oxygen. An obligate anaerobe cannot tolerate oxygen. An aerotolerant anaerobe can tolerate oxygen but doesn't use it. Aerobic means requiring oxygen.

Answer:

1. essential nutrient
2. a trace element
3. facultative anaerobe