If they test more than one variable, they wouldn't know if it was both variables or one variable that was responsible for any observed effect.
Answer:
Embryology can be used to provide evolutionary evidence because during the early development stages embryos of different organisms are very similar, suggesting that all organisms may have a common ancestor.
Explanation:
Embryology is the study of the anatomy development of an organisms from embryo to adult.
Answer: The genotype is homozygous and white petal color is a recessive trait
Explanation:
The only way for a recessive trait to be present in the phenotype is if the genotype is homozygous homo meaning same ex. pp or PP heterozygous hetero meaning different ex. Pp
The answer is D! birds have to migrate for winter to find an abundance of food! they learned this over time making it a learned adaptation