<span>19. At the end of this period, 96% of all life went extinct. This set the stage for reptiles to really take hold in the next era. - PERMIAN
</span><span>20. This is the first period of the Mesozoic Era. - TRIASSIC
21. This was the era of "ancient" life and was divided into six periods. - PALEOZOIC
22. Which era spans the least amount of time on the geologic time scale? - CENOZOIC
Precambrian - 544 million years ago
Paleozoic - 544 - 248 million years ago
Mesozoic - 248 - 65 million years ago
Cenozoic - 65 million years ago</span>
C production of carbon dioxide
Answer:
C bc tht are show tht same
All of the following are functions of skin except: excretion of body wastes, insulation, protection from mechanical damage, site of vitamin A synthesis site of vitamin A synthesis
vascular region of the skin dermis
major skin area as a whole that produces derivatives (nails and hair) epidermis
Answer:
a. Developing cells may express different parts of their identical genetic instructions.
Explanation:
Humans are multicellular organisms i.e. we possess many cells in our body. These cells increase as a result of division. Although all of the cells of humans develop from one fertilized egg (zygote), the human is born with many different types of cells because of a process called CELL DIFFERENTIATION.
Cell differentiation is a process in multicellular organisms where a cell becomes more specialized in function as it divides. The set of genes contained in each cell are not expressed simultaneously i.e. some genes are expressed while others are repressed. This is how cells with the same gene possess different functions. Therefore, according to this question, developing cells may express different parts of their identical genetic instructions to be of different types.