Answer:
Estrogen and progesterone are both involved in preparing the endometrium for embryo implantation. Estrogen helps to ensure conception by increasing the amount of secretory glands in the uterus. Estrogen also increases blood supply to the endometrium.
Progesterone is crucial for embryo implantation and maintenance of pregnancy. Progesterone also enlarges secretory glands that produce carbohydrates, proteins and mucin that are required for embryo nourishment before implantation. Progesterone stabilizes endometrial muscles to prevent them from contracting during pregnancy.
Explanation:
- Estrogen and progesterone are steroid hormones of the reproductive system. Estrogen helps in conception whereas progesterone maintains pregnancy. 
- Estrogen is secreted during the follicular phase of the menstrual cycle that promotes the growth and maturation of follicles in the ovary.
- Estrogen also induces oestrous behavior in females.
- Secreted by the corpus luteum, progesterone is also a steroid hormone, responsible for implantation of the embryo in the uterus. 
 
        
             
        
        
        
Answer:social,intellectual,perceptual,personality and emotional growth.
Explanation:
The study of development psychology is important in understanding how humans mature.The role of a development psychologist is to study the changes in human development across the life span.This changes include:
•physical
•cognitive
•social
•intellectual
•perceptual 
•personality
•emotional growth
 
        
             
        
        
        
Spirilla are spiral shaped bacteria cells
        
             
        
        
        
Skeletal and Muscular Systems
        
             
        
        
        
Answer:
Option A (mediate...........polypeptides) would be the appropriate choice.
Explanation:
- That's only because the leucine zipper symbol consisting of such a leucine remnant anywhere certain 7th point and has an α helical attachment. 
- Maybe the leucine including its zipper between one protein dimples again from α-helix as well as interdigit this same leucine including its iterator of some other antibody. 
Some other possibilities in question are not connected to something like the situation in question So that is the correct approach.