In a controlled experiment, an independent variable (the cause) is systematically manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled. The researcher can operationalize (i.e. define) the variables being studied so they can be objectivity measured.
Answer:
Macrophage
Explanation:
Monocytes move from the systemic circulatory system into general connective tissues, where they differentiate into what phagocytic cell type?
I think...
The correct sequence is:
1 Producers ( grass ): The producers are the green plants that produce food for the consumers. Green plants are the producers and energy produced is transferred to primary consumers
2 Primary consumer (mouse): The primary consumers include bacteria and herbivores that feed on the green plants for their energy
3 Secondary consumer (cat): The secondary consumers include the cat and other small animals that feed on primary consumers
4 Tertiary consumer (wolf): The are the at the highest level of hierarchy and feed on secondary consumers for their food. Example wolf,eagle
I believe it's the the decrease of owls and if i' wrong sorry
I think the answer is d ... hope this helps
