<span>B is the correct answer. The beginning of DNA replication occurs with the unwinding of the DNA helix by a special enzyme. The two strands that form the helix then create a replication fork. The two strands are then oriented differently, one becoming the 'leading strand' and one the 'lagging strand'. </span>
Answer:
deforstation
Explanation:
deforestation can affect competition of food for example when we cut plants for different purposes the animals that eat the plants will starved and die in this cause if want to eat animals products we could not get because animals are died because of the deforestation this cause food competition between human and animals
Vertebrates have a bilateral symmetry due to which their entire body is divided into right and left halves while the invertebrates either have radial symmetry or the bilateral symmetry. Therefore, option D is correct.
The other basic differences between the vertebrates and the invertebrates are that vertebrates have a spinal cord and a backbone while invertebrates lack them, vertebrates have well developed brain, lungs or gills in respiratory system and closed circulatory system.
Answer: prokaryotic cells
Explanation:
D oxygen there was no free oxygen on the earth
