Answer:
B. Sternum
Explanation:
The sternum (or breastbone) is a flat bone in the thorax's anterior area. It has a 'T' shape and is located in the center of the chest. The sternum, which is part of the bony thoracic wall, protects the internal thoracic viscera, such as the heart, lungs, and oesophagus.
Here is a picture from the internet.
Passive is when materials travel or move across some cell membranes that doesn't use cell energy.
Active is the meaning of a movement that crosses across some cell membranes that requires the use of cell energy.
Answer: The answer is that passive doesn't use cell energy but active uses cell energy.
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<span>C. The transferred electron from lithium to fluorine provides each atom with a full outer energy level.</span>
<span>palisade and spongy layers of the mesophyll are </span>the two layers of the plant containing chloroplasts
The answer is that the criteria of classification change whith the improved understanding of organisms around us