The organs of the heart and the blood vessels form which of the followings?

A. a cell

B. a tissue

C. an organ

D. an organ system

What system works closely with the digestive system?

Which statement about natural selection is true A. Natural selection and evaluation are two terms of the same phenomenon. B. Natural selection is an outdated theory to explain how evaluation took place. C.

Thin sheetlike structures which cover all surfaces and line the cavities of the body are known as

Select ALL the correct answers. A mother had blood type A and her son had blood type O. Which blood types are possible for the father? •O •AB •B •A

Which factors provide the basis for the differences observed in the major land biomes on Earth? A. Average temperature and average precipitation B. Average windspeed and average oxygen levels C. Average day length and average night length D.

What is the taxonomy of each organism from largest to smallest grouping? List or organisms: brown bear, gold fish, honey bee, fruit fly.

Choose the definition of: Invertebrates A. have a backbone B. having lost a backbone C. Having no backbone D. having several backbones

Imagine you are cutting a bagel (one of the most common household injuries) and you get a cut. The cut heals. How do the new cells compare to the original (pre-cut) cells

Which bacteria is Acid-fast?

Cómo clasificarías la Adenina