The steps involved in gas exchange in a fish are shown in random order. V - Water passes over the gills.
W - Water moves through the mouth.
X - Water passes through slits on both sides of the fish.
Y - Oxygen moves into the blood.
Z - Carbon dioxide moves into the water.

Which lists the correct order of the steps?

Elements and compounds are pure substances that cannot be broken down physically into a simpler substance. a physical change doesn’t break the bonds between atoms of a substance or form new ones. compounds can be broken down by a chemical change. a chemical change breaks chemical bonds and/or forms new ones between atoms of a substance. what simple substance would a compound break into? the basic elements that make it up! for example, if you passed a very strong electric current through water you’d break the chemical bonds in water and be left with oxygen and hydrogen. which of the following is an example of a chemical change? a separating water into different glasses b breaking frozen ice cubes with a hammer c running an electric current through water d boiling water to evaporate it on a stove

25. what does meiosis create? haploids or diploid? somatic cells or gametes?

9. the history of life on earth is recorded in