Help please! An example of a biologically formed sedimentary rock would be , which is formed from the remains of once-living marine organisms.

halite
gneiss
limestone

Sedimentary rocks that are formed from physical/chemical processes within the Earth are given the general name of .

clades
clastic
conglomerate

The image shows ekgs of a person with normal heart waves and of a person having tachycardia. based on this image, what kind of condition is tachycardia? a. the heart beats abnormally fast. b. the heart beats abnormally slow. c. the right atrium of the heart stops working. d. the left ventricle pumps less blood to the aorta.

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine