In cross-sectional studies, the midlife period is characterized by

increases in environmental mastery.

Explanation:

Cross-sectional study is defined by observational research, which analyzes data collected over a period of time. This survey can be in a sample population or in a predefined subset. This type of study is also known as cross-sectional study, cross-sectional study and prevalence study. The data collected in the cross-sectional study are from similar people in all variables. Except for the variable being studied.

Regarding middle age, cross-sectional studies are characterized by increases in the environmental domain as a shared feature among participants and research in this approach.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.