What is the function of the pectoral fin on the manta ray?

What are genotypes? what are phenotypes?

Ruby is conducting an investigation. an advantage of her design is that she can use a large range of variables, with that she can not be sure that one variable is the cause of another. what kind of investigation is ruby most likely conducting?

Many humans consume both plants and animals. these humans are considered to be which of the following? herbivores carnivores omnivores