The average sperm count in the developed world has fallen by one third over the last 15 years.
The present average sperm count is 30 million/cm of semen.
Calculate the average yearly fall in sperm production over the 15 year period.

Put the following steps of the convection process in the correct order. 1. gravity pulls cooler matter downward. 2. the matter expands and decreases in density. 3. an up-and-down flow of matter produces a convection current. 4. matter is heated. 5. warmed matter is forced upward. question 2 options: a) 4, 2, 5, 1, 3 b) 2, 4, 3, 1, 5 c) 3, 2, 5, 4, 1 d) 1, 4, 2, 5, 3

The tubes transporting minerals and water upward are called ?

Patient has just received an organ transplant which treatment would be most effective in preventing the patient’s body from