Claim, Two parents with brown eyes can have a biological child with blue eyes., Exercise causes human heart rates to increase in order to maintain cellular function., Evidence, Between 1995 and 2010, the height of willow and aspen trees along rivers increased by over 200%, and riverbank erosion decreased significantly., During a 10-minute run, a student’s heart rate rose from 72 beats per minute (bpm) at rest to 145 bpm., Reasoning, Photosynthesis requires light energy to split water molecules into hydrogen and oxygen. Without light, the light-dependent reactions cannot occur, so no oxygen gas is generated., According to the laws of genetics, blue eyes are a recessive allele (b) and brown eyes are dominant (B). If both parents are heterozygous (Bb), each has a 25% chance of passing on two recessive alleles (bb), resulting in a blue-eyed child.

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