Atrophic level is
a.) the basic unit of energy in an organism
b.) the level of energy in a food chain
c.) the level directly above the consumer level
d.) the highest level in the food chain

Iron reacts with oxygen to produce iron oxide (rust). this reaction is represented in an equation as 4fe + xo2 → 2fe2o3. identify the value of x that will balance the equation.

The buildup of sediments where a river empties into a slow-moving or nonmoving body of water is known as a/an

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.