When several cells combine together, they form A.
Bacteria
B.
Tissue
C.
Organ systems
D.
Prokaryotes

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.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

During photosynthesis, hydrogen ions are most directly used to in the chloroplast pictured above. a) make glucose b) make chlorophyll c) produce carbon dioxide d) drive the production of atp