Answer:
Fish that conform to the biological definition are often referred to as true fish or finfish. There are three major groups of finfish: superclass Agnatha (jawless fish), class Chondrichthyes (cartilaginous fish), and class Osteichthyes (bony fish).
The hedgehog ligans activate it
The answer would be:
<u><em>B. Acceleration is a vector quantity.</em></u>
We can rule out the others because:
---Acceleration CAN be described with a negative number. The sign actually shows the direction. A negative number indicates a deceleration.
---Displacement change over time is the definition of velocity NOT acceleration.
---The SI unit for acceleration is m/s².
***A <em>vector quantity</em> is measure of <u>magnitude</u> and <u>direction</u>, which acceleration has.
Answer:
Provides a surface where algae attach and provide food for the corals
