Some types of aquatic frogs bury themselves in the mud amnd spend hte winter hibernating at the bottom of lakes and ponds. which characteristic of life does this behavior represent

This behavior represents the dormancy.

Dormancy is a period in life cycle of an organism when growth, development, and  physical activity are temporarily stopped. Period of dormancy minimizes metabolic activity of an organism and therefore helps them to conserve energy. So, aquatic burrowing frogs get into energy-saving mode as long as resources are scarce.

organisms that are both used in toothpaste as well as cause malaria are protista and monera.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.