A puppy has a short tail. His father has a short tail, but the puppy’s mother has a long tail. The long tail allele is recessive. The best explanation for the puppy having and showing a short tail is * 1. a gene mutation occurred that resulted in a short tail
2. the puppy only received DNA from the father
3. the puppy received genetic information from each parent, but the short tale allele was dominant
4. the puppy only received DNA from the mother

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

Which would be an adaptation in a rainforest, but not in a tundra? a. ability to store water for a long time b. fur that blends in with snow c. strong claws for killing prey d. a beak that can dig into thick trees

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data