QUESTION 21. In the following diagram, nerve cell A is commu-
nicating with nerve cell B. Identify the structures
present on the membranes of nerve cell B that
enable it to detect a message from nerve cell A.
E Nerve cell AVC
-Nerve cell B

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

Using the periodic table, determine which material is most likely a good conductor

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen