How do scientists try to answer questions that cannot be tested with experiments?

How is the gender of a baby determined

A scientist is designing an investigation to study the impact of UV radiation present in high-altitude habitats on the population of mountain yellow-legged frog.

Its cells are not thought to contain mitochondria but do contain genes that are similar to the genes for muscle proteins. State and explain the domain into which these organisms should be classified. 3 main domains are: Bacteria, Eukarya, Archaea.

The peripheral sympathetic nervous system: its role in normal and pathologic anxiety. export export add to my list email print share

A system is made up of several parts that

For some reason (not yet understood) more male babies are conceived (born) than female. By childhood the number of boys and girls is the same. what is the possible explanation for the higher mortality (both before and after birth) of male babies?

A child's pituitary gland does not release enough hormones. What is the most likely cause of this? A. The child has no ovaries. B. The child has no adrenal hormones. C. The child's blood glucose level is too high. D.

Which tissue is correctly paired with its primary cell type? which tissue is correctly paired with its primary cell type? bone; osteoblast connective tissue proper; chondroblast cartilage; fibroblast bone; fibrocyte?

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Roentgens are used to measure the amount of: A) uranium, B) fuel burned, C) radiation, D) hydrogen isotopes