A friend explained to

you that she combined

two substances and

saw a color change.

What additional

information would you

need to determine if this

change was a chemical

or physical change?

I live in wet land, I respire through roots

What is the connection between skin sunlight and vitamin d?

Which of the following statements is correct for the karyotype? . Number of chromosomes in male differs from that of female in the human cells. The number of chromosomes in the cells of the same species is constant.

Charles darwin proposed a mechanism for descent with modification that stated that organisms of a particular species are adapted to their environment when they possess

How do genes and environment interact?

What type of blood vessel returns blood to the heart? A. Artery B. Vein C. Capillary D. None of the above

Why is fatigue one of the syptoms of iron-deficiency anemia?

During binary fission, DNA copies move to opposite ends of the parent cell. This process is most similar to which phase of mitosis?

What is the name for the ability of living things to maintain a relatively constant internal environment? homeostasis stimulus-response cellular respiration metabolism?

The future of biology in 100 years