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10 Cards in this Set

  • Front
  • Back
What is a tissue?
A group of structurly similar cells performing a similar activity
Two or more different tissues working together to carry out a common function is called an _________
What is the fourth level of organization of living things
a system
What is osmosis?
a special kind of diffusion- it is the net movement of solvent molecules(usually water) from an area of high concentration to an area of low concentration across a selectively permeable membrane.
What does selevtively permeable mean?
that only water and some substances can pass through the membrane, but other substances cannot.
What is diffusion?
the net movement of particles from an area of high concentration to an area of low concentration
What is diffusion gradient?
this is the differnce in concentration between two regions before diffusion occurs
Most aquatic animals excrete what?
Living organisms obtain many of their requirements by_____
What is cell specialization?
this is when each cell has a special shape so that it can carry out a particular activity.