D. S phase of Interphase.
The 2nd chromatid is made during DNA replication, where each linear DNA molecule is replicated to result in genetically identical pairs of DNA strands.
During Prophase stage of Mitosis, each strand of DNA condenses to form the sister chromatid of each metaphase chromosome. Sister chromatids are linked to each other via kinetochore proteins linked to the centromeric regions of each sister chromatid.
Thus, sister chromatids are genetically identical to each other.
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The answer is; fossil
Fossil is defined as any dead organism ( or its trace or impression) of a past geological time that is naturally preserved in the earth in geological features such as rocks, bogs, and etcetera. Coral reef is no exception because it is considered a living organism. It is composed of colonies of coral polyps and algae that secrete a carbon carbonate skeleton.
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Answer: three types of neuron are ;sensory,interneuron and motor neurons
Explanation:
The three types of neurons are
Motor neurons
Interneurons
Sensory neurons
Sensory neurons- it receives impulses and carry them from the sense organs to the spinal cord or brain
Interneurons-it connects sensory
Motor neurons-it interprets the impulse only in the brain and spinal cord