Which of the following statements is true?

aThe matter in an ecosystem must be continuously replenished.
bThe total amount of energy in an ecosystem remains the same.
cThe only way to return matter to the soil is decomposition.
dThe total amount of water in an ecosystem is always decreasing.

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

What is the difference between sex-linked traits and autosomal traits in humans? a. sex-linked traits can only be passed from fathers to sons, while autosomal traits can be passed on from both parents to offspring of any sex. b. sex-linked traits are passed on through the x and y chromosomes, while autosomal traits are passed on through the other 22 chromosomes. c. sex-linked traits only affect females, while autosomal traits affect both males and females. d. sex-linked traits refer to genes that are on the x and y chromosomes, while autosomal traits refer to genes on all 23 chromosomes.

What are characteristics of minerals? select 3 choices