As osteoblasts deposit new bone matrix on the surface of bones between the periosteum and the existing bone, the bone increases in (1) . Growth in the (2) of a bone, which is the major source of increased height in an individual, occurs in the (3) . Just as in endochondral ossification, (4) increase in number. Within the (5) zone, the chondrocytes line up in columns, hypertrophy, and die. The cartilage matrix is (6) , and (7) start forming bone matrix on the surface of the calcified cartilage. This process produces a zone of (8) on the diaphyseal side of the epiphyseal plate.

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

I’m stuck on this question cuz i’m stupid sksksksk

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.