Answer: Radioactively-labeled materials
Explanation: nuclear medicine is a medical specialty that uses radioactive tracers to diagnose and treat different diseases. Radioactive tracers are materials that can vary according to the purpose of the method. For most diagnostic, the radioactive tracer is administered by intravenous injection. However it may also be administered by inhalation, by oral ingestion, or by direct injection into an organ.
SPECT scans are primarily used to diagnose and track the progression of heart disease, and the major purpose of PET scans is to detect cancer and monitor its progression, response to treatment, and to detect metastases. This two methods are the most used in nuclear medicine.
Several ways for sure,
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Recent studies on giraffes across Africa suggest that they constitute<u> four</u> different species.
<h3><u>What various giraffe species are there?</u></h3>
Genetics underlies the differentiation between a species and a subspecies. A new species is distinguished from a subspecies when there are sufficiently large genetic differences between groups of the same species that prevent individuals from the two species from mating and conceiving viable offspring.
In other words, no other group of animals can be used to replicate the gene pool of a species because it is wholly unique to that group of animals. The southern giraffe population is increasing, in contrast to the other three giraffe species. A subspecies of the southern giraffe, the Angolan giraffe is mostly found in Namibia and Botswana.
An additional subspecies, the South African giraffe, is found in portions of Botswana, Zimbabwe, Angola, Zambia, South Africa, and Mozambique.
Learn more about the species of giraffe with the help of the given link:
brainly.com/question/16208755
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