Answer:
SPECT Single-photon emission computed tomography
Explanation:
SPECT is a technique that is used for tomography of the brain to know how the tissue and blood working in the brain. It shows the activity in the brain. This technique helps in diagnoses brain stroke, head injury, ischemia attack, blockage and mental illness like schizophrenia, Alzheimer's, etc.
It is an unclear imaging technique that merges with computed tomography and finds out the problem through a combination of SPECT. Before doing SPECT, an injection is injected into the blood stream. This technique is used to know the blood is flowing in arteries and veins.
Answer: c. internal summary.
Explanation: Internal summaries are best used when the information within a specific main point of a speech was complicated.
It is a quick review of what a speaker has just said in a main point or sub point; used to help an audience remember a particularly detailed point.
When a glacier retreats, and the sea fills the resulting valley floor.
This is of course a very complex question that does not have a definitive answer, but 1850s would be a good decade to start counting as "Modern". This was a decade of the telegraph and Darwin's The Origin of Species.
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