The sum of all energy transfers within a sell is known as a) photosynthesis; b) cellular respiration; c) metabolism; d) replication; e) conjugation.

Which of the following elements does soil need in the largest quantities to sustain plant life? a. copper b. iron c. nitrogen d. zinc

Many organs are involved in the processes of keeping the blood and the body clean. when poisonous or harmful substances are in the blood, they are absorbed by the and released in a less harmful form. when wastes are present in the blood, they are filtered out and removed from the body by the

What happens whenever a net force acts on an object