Answer: A
Explanation: hypothesis is something na hindi pa napatutunayan at nagpag-aaraalan while theory is something na backedup with evidences and data
To prevent blood flowing back after each heartbeat. They ensure that the blood flows only in one direction (back to the heart).
Acceleration is a little more complicated. It is defined as the rate of change of the object's velocity over its change in time. ... Or, if the acceleration is negative, it's called deceleration and describes something slowing down. For something to speed up or slow down, it has to have a certain change in velocity
Answer:
evaporative heat loss + convective heat loss + conductive heat loss + radiative heat loss
