A. Your leg jumping when it is hit by a reflex hammer
The cell membrane is semi-permeable, kind of like a filter to let some molecules in and keep larger molecules out
The major adaptive advantage of cellular respiration is that they produce ATP.
Each combination of 3 nucleotides are called a codon. The codons then determine which amino acids are going to be inserted in the protein
Production of the mature sperm cells have 4 step process beginning at puberty and throughout the male's lifetime. Spermiogenesis is the final process for production of sperm where the spermatids mature into motile spermatozoa. For humans, the spermatogenesis takes 74 days to 120 days and if the transport on the ductal system is included it would take 3 months.