Womersley number (a) of a human aorta is 20 and for the rabbit aorta is 17, the blood density is approximately the same across the species. The values of viscosity were 0.0035 Ns/m² for the human and 0.0040 Ns/m² for the rabbit. The diameter of the aorta is 2.0 cm for the man, and 0.7 cm for the rabbit, estimate the heart rate beats per minute (bpm) for both species.

In a biology laboratory, the teacher provided the each student group with two long bones (chicken) without the flesh. Following teacher's guidance, one of the long bone was placed in a beaker containing vinegar (7% acetic acid), a weak acid and let it sit for 3 days at 370 C in an incubator. The other long bone was left in beaker containing distilled water and placed in the same incubator.  The students were very curious - on the 4th day, they used gloves and removed the bones from respective jars with utmost care. The teacher asked them to write their observations (what happened) and the explanation (why did it happen) in the lab notebook in view of the structure-function relationship of bone. Assuming we are doing this lab activity. describe the observation in the vinegar treated long bone compared to the control set and  explain  
what actually happened to justify  observation

The density of silver (Ag) is 10.49 g/cm^3 and that of Nickle (Ni) is 8.9 g/cm^3. A comparison of the volumes (V) of 50 gram samples of each metal will show that? (A) Vag > Vni (B) Vag < Vni  (C) Vag = Vni  (D) there is no predictable relationship between volumes

please answer a