The production of chlorophyll molecules requires most plants to obtain __________ from the

soil.



a. calcium
b. magnesium
c. nitrogen
d. potassium


C

Biology & Microbiology

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Breathing is primarily regulated by _____

A) erythropoietin levels in the blood B) the concentration of red blood cells C) hemoglobin levels in the blood D) carbon dioxide concentration and pH-level sensors E) the lungs and the larynx

Biology & Microbiology

The diaphragm is a sheet-like skeletal muscle that separates the

(a) thoracic and pleural cavities. (b) thoracic and pericardial cavities. (c) thoracic and abdominopelvic cavities. (d) pleural and pericardial cavities.

Biology & Microbiology

How small is the smallest object that can be observed using a transmission electron microscope?

a. 2 µm b. 0.2 µm c. 2 nm d. 0.2 nm

Biology & Microbiology

what digestive organ produces and secretes bile, regulates blood glucose by producing or breaking down glycogen, converts amino acid group from excess amino acids to urea, stores iron and certain vitamins

What will be an ideal response?

Biology & Microbiology