Answer:
They are pores encircled by specialised parenchymatic cells, referred to as guard cells. Stomata have 2 main functions, particularly they allow for gas exchange acting as Associate in Nursing entranceway for dioxide (CO2) and emotional the O (O2) that we tend to breath. the opposite main perform is regulation water movement through transpiration.
Answer:
Longitudinal
Explanation:
Longitudinal studies are conducted when the effect of the same variable influencing a subject takes place for a longer duration of time
Here, poverty of the children is the variable which they are being subjected to over a long period of time. Now, Dr. Casey wants to study the affect of poverty on a child's academic performance over a long span of time.
Hence, this type of study is called Longitudinal study
B:the number of enslaved workers grew
this is because they needed more people to help farm the crops
