The heart contracts twice for every heartbeat one contraction is the atrial contraction while the other is the venture true or false

What is more stable a food chain or food web?

Match the following. 1. a positively charged ion; an atom which has lost an electron cation 2. a negatively charged ion; an atom which has gained an electron pH 3. the compound formed by the ionic bonding of a cation and anion salt 4.

Which part of the body contains enzymes that break down protein a. teeth b. skin c. stomach d. brain

Which type of fermentation sometimes occurs in human muscle cells

Describe and explain the importance of the change to corn

Which phrase defines a law? a possible explanation or answer to a scientific question that is based on prior knowledge or research and is testable A statement of fact that is generally accepted to be true and universal because it has always been

Which vessels allows for oxygen movement into the tissues

What is the difference between a physical and a chemical change

What is described by binary fission? A) The way prokaryotes move. B) The way prokaryotes produce energy. C) The way prokaryotes reproduce. D) The way prokaryotes digest nutrients.

There are many different ecological and environmental conservation methods. Which is not a conservation method? A) water harvesting B) fishing seasons and limits C) limiting of clear cutting of forests D) wind and wave erosion on coastal areas