A sample of a radioactive element has a mass of 80 g. How much parent and daughter materials are in the sample after two half-lives?

A carbohydrate is an organic compound that is composed of carbon, hydrogen, and oxygen. The unique structure of carbohydrates makes them useful material for building cell walls in plants.

What is the difference between the chromosomes in a secondary spermatocyte and those in a spermatid. A) The chromosomes in secondary spermatocytes consist of two chromatids; the ones in the spermatid consist of only one chromatid.

What is primary function of the highlighted vessel? a) blood supply to the scalp b) blood supply to muscles of mastication c) blood supply to facial muscles d) blood supply to the brain

Write a word equation for cellular respiration in cells.

Which of the following best describes Mendel's idea of segregation? A. Each parent may pass on one or two factors for each trait to its offspring. B. Male offspring receive chromosomes only from the male parent. C.

How macromolecules are broken down and used to make new molecules.

How do soils form? A. Plants cement mineral particles together to form soil. B. Plants provide organic matter and minerals to make soil. C. Erosion transports mineral particles, and plants die and decay. D.

Give three examples of places bacteria live.

How can scientists learn from observations

The minimum amount of energy the body uses at complete rest is known as the energy balance. resting metabolic rate. metabolic balance. basal metabolic rate.