When dna is copied, sometimes a new, incorrect, base pairing appears within the structure of a new dna molecule replacing original base pairs. this mistake is called a base-

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

Deer cave cannot support photosynthesis is as not enough sunlight is present. in spite of this, it still has a complex food chain. what is the energy foundation of this food chain?

All vaccination should(n’t) be mandatory! 1.at least 5 sentences explaining 2.why? 3.in the end summarize the sentence