A.) An allele is a version of a gene that can be expressed as a phenotype.
The answer is A, friction.
Friction is the force that resists movement, and that's why oil is used as a lubricant and why ball bearings are used for machines that need to move with very little friction(i.e. bike wheels, roller skates, fidget spinners)
Answer B is too vague
C will probably reduce efficiency greatly, but not specifically in a way that turns work into thermal energy.
D is the same as C, except that it places the blame on the person using the machine, not the machine itself.
Hope I helped clear it up for you :)
I know for a fact c is one of the correct answers and I also think b is the other correct one
A, bacterial conjugation
Explanation:
I think it's this because in step 4, the things under the oval-ish circle looks like bacteria
Answer:
when the cells can't pump out the calcium out, it concentrates in the muscles forcing muscles to constrict and lastly waste away when the muscle proteins decompose
