Which of the following bar charts describes a system that is in solution equilibrium?

Which is not a characteristic of the animal kingdom? a. they include both vertebrates and invertebrates b. their skin is covered with hair or fur c. they are heterotrophs d. they are eukaryotic

Which of the following systems in absorbing oxygen and releases carbon dioxide

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above