Directions: Select the correct answer from each drop-down menu.
Since then, newer classification systems
The earliest classification systems grouped organisms based on anatomical similarities.
have focused on genetic analysis to better understand evolutionary ancestry.

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

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

According to the cladogram, which organisms have roundworms as a common ancestor?