Myofibrils are the building blocks or contractile unit of each muscle fiber. The tiniest functional unit of skeletal muscle, the sarcomere, is found in the myofibrils and is made up of protein filaments: actin (thin) and myosin (thick).
Prophase I would be correct...
The answer is (b.) ecosystem. An ecosystem is all living organism in an area functioning together with nonliving factors of the environment. An Ecosystem is a community of the living organism that includes the producers, the consumers, and the decomposers.
<span>Unsustainable versus Sustainable Living. ... We cannot live sustainably without a healthy en- vironment, but our unsustainable lifestyles are causing environmental degradation, making it more difficult to live sustainably. Humanity's enormous environmental impact is causing a global crisis.</span>
