The element that is the central atom in the vitamin B₁₂ (cobalamin) molecule is: MCQ with Answer and Explanation

Explanation:
Urine specific gravity, a measure of solute concentration, normally ranges from 1.015 to 1.030. It varies with hydration status: low when dilute (after drinking), high when concentrated (dehydration). Diabetes insipidus shows low SG, diabetes mellitus may show high due to glucose.

Explanation:
A population is a group of individuals of the same species living in a specific geographic area and capable of interbreeding. A community comprises all the interacting populations of different species (plants, animals, microbes) living together in a defined area. An ecosystem is a functional unit of nature that encompasses both the biotic (living community) and abiotic (non-living physical environment like soil, water, sunlight) components, interacting as a complex system. All statements are correct.

Explanation:
Rosie, the first transgenic cow, was created in 2000. She was genetically modified to produce milk that contained human alpha-lactalbumin, a protein found in human breast milk. Her milk was nutritionally more balanced for human babies than normal cow's milk, containing about 2.4 grams per liter of this human protein. This demonstrated the potential of transgenic animals for producing pharmaceutical or nutritional products.