State two reasons why some molecules can pass through a certain membrane, but other molecules can not.

Awater molecule is polar because there is an uneven distribution of these between the oxygen and hydrogen atoms.

What did hunter gathers do to alter the environment?

Cassandra made a venn diagram to compare and contrast the two stages of cellular respiration. which belongs in the area marked x? energy is released. oxygen is used up. glucose is broken down. carbon dioxide is used up.