How do the elephants help to maintain the population of birds that you can see perched on their backs in the picture
above?
The elephants supply a place for the birds to nest and reproduce.
The elephants supply a much needed food source by allowing the birds to
eat bugs off their backs.
The elephants provide diversity in ecosystems by carrying the birds long
distances as they travel in herds.
The elephants provide a fresh water supply by carrying the birds back and
forth from their local watering hole.

Categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. makes predictions

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

Why did mendel use pea plants in his experiments? a. they have no alleles. b. they are haploid organisms. c. they reproduce quickly. d. they are all male.