homeostasis
Organism
It's because the oral cavity all the way to the anus is "open" to the external environment. Internal body cavities are those that are completely walled off from the external environment by well defined structures such as skin, mysentary, etc. In contrast the GI tract is specifically designed to periodically open to the external environment an allow food to enter and waste to leave.
keystone species
The term of having an ecosystem in a jar is defined as terrarium. A terrarium is a closed environment for keeping and raising plant species for research.
A name for plants is flora. Flora is defined as plant life. Flora is especially used when expressing a plant of a certain region, period, or environment.
homeostasis
homeostasis
Organism
Relative viscosity is defined as ratio of viscosity of solution to that of a pure solvent.
Internal energy is defined as energy associated with the random, disordered motion of the molecules.
Internal energy is defined as energy associated with the random, disordered motion of the molecules.
label the internal parts of the cpu
Environment
The environment is defined as the surroundings of something in particular. This question can only be answered if you define the environment about which you are inquiring.
One is that it has to be defined relative to a given frame of reference.
Displacement
Vertebrates are defined as having a spine and internal skeleton.