Answer:
d. in sequence is the correct opyion
46 for humans.
That’s 23 chromosomes from each parent.
1. Aurora
2. Ion
3. Thermosphere
4. Troposphere
5. Stratosphere
6. Ionosphere
7. Mesosphere
8. Ozone
9. Ozonosphere
Heart muscle cells have high number of mitochondria to produce energy in the form of adenosine triphosphate. Heart muscles need a lot of energy so it won't tire out while contracting.