I believe it is A or B. I’m quite torn. I did research to back my answer up and it’s said that the atmosphere would become less and less oxygenated, perhaps becoming unbreathable for humans. The temperatures would also become lower, The land would fry.
Answer:
A) One band of intermediate density and one band of heavy density.
Explanation:
According to semi conservative model of replication the two DNA strands separate during replication such that the new DNA molecule has one parental strand and one new strand. In this experiment, originally E.Coli cells were grown in 14N medium so all the DNA strands had 14N. When the medium was changed to 15N, only 15N would be available to the cells for replication.
After first round of replication all DNA molecules would be of intermediate density as one strand would be old 14N strand and another would be new 15N strand. After second round of replication 15N strand would be formed from both 14N strand and 15N strand. So, one band will be formed of intermediate density (14N-15N) and another would be of heavier density (15N-15N).
B chloroplasts, cell wall since the animals don't have or need them.
Energy is lost at each Trophic level of a food chain. The more levels then the more energy lost to those at the top.
