The greatest error in the experimental design is that the temperature of both bins were taken at different times from each other. The students should have measured them at the same time to lessen the randomness of the variables. A way to "fix" this is by changing taking into account the extra time between bin A was and bin B was measured for bin B's calculations.
The heart is in the diastole phase. In the diastole phase, the heart muscle relaxes and allows the chambers to fill with blood in preparation for the next cycle. In the systole phase, on the other hand, the heart muscles contract and this causes the ejection of blood into the aorta and pulmonary trunk.
A species specific use of the biotic and abiotic factors in an environment is collectively called the species' habitat. It is because the abiotic and biotic factors plays an important role in the habitat of the species where it helps it in certain ways.
B. Pivot
The atlas and axis vertebrae act as a pivot joint.