For an animal to move in one direction, its muscles must do all of the following except

a. overcome the effects of friction.
b. exert a force in the opposite direction.
c. spend energy.
d. overcome the effects of gravity.
e. exert a force in the same direction.

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

hope i

-lavira: )

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

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.