Long-term data are valuable in assessing the health and stability of a community. conservation biologists look for changes in a community over time to alert them to the fact that something is wrong with the community and that potential threats need to be assessed. of particular importance to understanding community stability is the change in the

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.

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.