The organisms in the image have shells made of 
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Fees
Charges or payments made for professional services, access to facilities, or other services provided by businesses or professionals.
Freemium Model
A business model where basic services are provided free of charge while more advanced features must be paid for.
Free Newspapers
are newspapers distributed without charge, often funded by advertising revenue, and aimed at increasing readership and influence.
Q5: What happens when two populations become geographically
Q12: You find a new organism. It gains
Q19: If a substance measures 7 on the
Q23: The simplest multicellular animals that have only
Q31: Isotopes are atoms of the same element
Q33: The endoskeleton of an echinoderm is composed
Q54: An arthropod exoskeleton is composed of<br>A) silica.<br>B)
Q61: Which of the following is most likely
Q69: A shift in weather patterns causes a
Q96: All animals with tissues have<br>A) radial symmetry.<br>B)