Organisms tolerate only limited variation in environmental osmotic concentration.
a) euryhaline
b) stenohaline
c) osmoregulator
d) osmoconformer

stenohaline

Explanation:

Stenohaline are organisms usually the fish, like goldfish which cannot tolerate fluctuations of their environment to salinity. They can die due to high or low salinity in their environment. Most fo this organisms are concormers and therefore their body do not change in osmolarity concentration due to salinity.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.

food source and hunting?