Which of the following statements is true?

aWater and energy are not recycled in an ecosystem.
bWeathering is the main way phosphorous is recycled.
cThe total amount of energy in an ecosystem continuously increases.
dThe organism at the top of a food chain receives the most energy from the sun.

Differentiation of cells changes the nucleic information. true false

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

What is a limitation of using a chemical formula, such as c6h1206, to represent a compound? the chemical formula does not show the types of elements that make up the compound. the chemical formula does not show how the atoms are connected to one another the chemical formula does not show the number of atoms of each element in a molecule. the chemical formula does not show the chemical symbols of the elements in the compound