Which type of molecule reinforces the shells of forams?
a. calcium carbonate
b. hydrogen sulfide
c. copper sulfate
d. silica
Ans: a. calcium carbonate
You might also like to view...
Betaproteobacteria is a functionally diverse group that primarily uses anaerobic metabolisms
Indicate whether the statement is true or false.
When the concordance rate of a trait is significantly higher in identical twins than it is in fraternal twins, we can conclude that:
A. the trait has a strong genetic component. B. the trait has a strong environmental component. C. the trait has a strong genotype-byenvironment interaction. D. the trait has a strong norm of reaction. E. the trait has both a strong genetic component and a strong norm of reaction.
The best way to prevent desertification is to avoid farming in areas that are subject to __________. Fill in the blank(s) with the appropriate word(s)
Circular DNA molecules found in nature are
A) positively supercoiled. B) negatively supercoiled. C) not supercoiled, due to their small size. D) always oriented in a triple helix to conserve space. E) always in the Z-DNA formation.