Which of the following represents an ecological niche? Honeybees making honey from flower nectar in a grassland ecosystem
The mud in a pond ecosystem
The cacti in a desert ecosystem
Robins and sparrows living together in the same tree in a forest ecosystem

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

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity

Which if the following best describes why invertebrates isn’t considered a scientifically valid word when classifying animals