Answer:
The Cell Membrane.
Explanation:
To enter or leave a cell, the substance must pass through the cell membrane. (plasma membrane)
Answer:
Since it is likely that the weeds in the lake act as a food source for organisms within that ecosystem, killing all the weeds would harm the population that feeds off them, and in turn the populations that feed off of them.
Answer:
<em>a. Cross-sectional study</em>
Explanation:
A cross-sectional analysis <em>includes at one particular point in time looking at data from a population.</em> Participants are chosen based on specific variables of interest in this type of study.
For developmental psychology, cross-sectional experiments are often used, but this approach is also used in many other fields, including social science and education.
Answer: It must have the ability to replicate faithfully It must be variable. It must perform the action associated with the phenotype. It must contain complex information.