The decrease in atp after death causes muscles become stiff in what is known as rigor mortis. why is the lack of atp causing stiffness?
a. because atp is needed to perform the power stroke
b. because atp is needed to in order to form a cross-bridge between actin and myosin
c. because atp is needed to displace troponin
d. because atp is needed to release the calcium ions from the sarcoplasmic reticulum
e. because atp is needed to break the cross bridge between actin and myosin

Can you identify which of the following groups of organisms are, or are not, populations? a. the american bison (bison bison) and grey wolves (canis lupus) currently living in yellowstone national parkb. all of the rainbow trout (oncorhynchus mykiss that) that have ever lived in lake eriec. the group of american bison (bison bison) currently living in yellowstone national parkd. a group of calliope hummingbirds (selasphorus calliope) and a group of rufous hummingbirds (selasphorus rufus) living in the same new hampshire woodse. the northern cardinals (cardinalis cardinalis) living on opposite shores of lake champlain f. all of the whales currently living in the atlantic ocean off cape cod, massachusetts

Brainliest ! which would require more force to move or slow down between a bowling ball and a soccer ball? explain why?

Which structure in the cardiovascular system connect arteries to veins?