Answer: a. endoderm-bone
Explanation: In the context of embryonic development, bone tissue may arise from several precursor cell populations, such as the neural crest (some facial bones), lateral mesoderm (bones of the limbs, among others), and paraxial mesoderm (vertebrae and part of the skull). There is no evidence to suggest that any of the bony structures is derived from the endoderm germ layer.
Answer:
B. A helicase enzyme unwinds the DNA molecule, then corresponding nucleotides are added to the separated original strand forming two separate semiconservative molecules
Explanation:
DNA Replication is an important phenomenon as far as cell division is concerned. It is the process whereby a DNA molecule doubles its content or forms two DNA molecules from one.
In the semi-conservative model of DNA replication, an enzyme called DNA helicase unwinds the double stranded DNA molecule into two single strands. The single strands are then used as template for DNA polymerase to synthesize another molecule of DNA. Hence, two separate DNA molecules comprising of one old strand and one new strand.
<span>digestion, absorption, transport, elimination</span>
Answer:
Sedimentary rocks were used to construct the time scale.
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Answer:
Two domains: Archaea and Bacteria
Explanation:
There are three domains of life namely Archaea, Bacteria, and Eukarya. Both Archaea and Bacteria contains organisms that reproduce asexually, i.e. binary or multiple fission, fragmentation, or budding. By these means, organisms divides its cells to more than one cells containing splited genetic materia. The dividing cells then can survive independently.
