Water is the single source as it provides the electrons by splitting into oxygen and hydrogen. This process happens during the light-dependent reactions.
I think it’s the Hershey one because quantities means quality and measurement
Technically this can be answered in a number of ways. But in elementary biology the cell is considered to be the basic unit of life.
Answer: When a heterozygous guinea pig (Rr) is crossed with a homozygous guinea pig (aa), the possible genotype of the offspring contains Rr and rr. Each genotype has a 50% chance of occurring in a specific generation. Nine offspring can have smooth coats as heterozygous (Rr) and homozygous (rr) parents indicate low chromosome recombination frequency (in this crossover). Genes close together on the chromosome indicate low recombination; thus, the crossover would rarely happen.
Tropism is important for plants to protect themselves from drought conditions through positive hydrotropism and against water over saturation through negative hydrotropism.