The answer is the fourth choice
<span>Cross bridges are created when myosin heads bind to ATP. This phenomenon is basically muscle contraction at work. In order for myosin heads to be bound with ATP at the actin active site, it must be excited with Calcium.
Once myosin heads bind with ATP, it begins to slide and perform muscle contractions in the body, allowing a person to move.</span>
Answer:
Level 1...Plants and algae make their own food and Plants and algae make their own food and are called producers.
Answer:
b
Explanation:
the worm is living while the leaf is not
