Why do scientists believe that the first organisms on Earth were extremophiles?

What is the difference between a Scientific Hypotheses and a Scientific Theory?

What are animals ribs made from

Which of these body systems is involved in coordinating and controlling body movements and response? A. respiratory B. digestive C. endocrine D. nervous

Which of the following offers the most complete list of how proteins function in the body A) Energy production, enzyme development, increased reaction speed B) Structural supports, communication within the body, defense against foreign invaders C)

How many pairs of chromosomes does a human have in their liver cells

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

From what specific substance in air does most of the mass of sugar come from