D an untested claim
A theory is a question or prediction that can be tested.
The second and third class levers both have (d) the fulcrum at one end of the lever. For class two levers the load is in the middle, and effort is at one of the sides. Third class levers have effort in the middle, and the load on one of the sides. Both meaning second and third class levers have the fulcrum on one end of the lever.
1. You would be able to see the DNA/ genetic material during mitosis.
2. You can see the nuclear envelope in interphase
3. The nucleus is completely disassembled in mitosis
4. You can see the chromosomes in mitosis
I hope this helps! Sorry I’m a bit tired, feel free to comment any questions you may have.
Interesting! Well, hydrogen bonds are said to the weakest but they provide just enough of a bond for attraction. Covalent bonds involve sharing electrons and and stronger than hydrogen bonds. So if you had covalent bonds they would hold on to the strands with greater strength. This would actually be problematic being that DNA need to have the ability to separate in replication.