Answer:
1. Natural
2. Natural
3. Natural
4. Manipulative
5. Manipulative
6. Manipulative
7. Natural
Explanation:
In a natural experiment, the researcher can specify that any proposed health implications could be due to exposure to the toxic chemical, but proving its direct causation is difficult. Natural experiments are majorly fixed to promoting correlation, unlike the manipulative experiments which usually strongly reveals causation.
Manipulative experiments changes the amounts of a predictor factor and estimates how one or more variables acts to these changes. It is employed in a test cause-and-effect. It cannot be used for large experimental scales as they are for small spatial scales experiments.
Natural experiments makes use of an observational study on natural variation in the variable of interest. It is used for large spatial and temporal scales without the need for manipulations but cannot be used for the direction of cause-and-effect.
The placenta produces hormones to help the baby stay healthy and grow it also fights bacteria in the womb
Answer:
Vestigiality is the retention during the process of evolution of genetically determined structures or attributes that have lost some or all of their ancestral function in a given species. Assessment of the vestigiality must generally rely on comparison with homologous features in related species
Explanation:
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I belive this is false but im not sure. You should add more info. I cant tell what you are asking me.
