<span>A selective backup allows a user to choose specific files to back up, regardless of whether or not the files have been changed.</span>
        
             
        
        
        
Professional development is learning to earn or maintain professional credentials such as academic degrees to formal coursework, conferences and informal learning opportunities situated in practice. It has been described as intensive and collaborative, ideally incorporating an evaluative stage.[1] There are a variety of approaches to professional development, including consultation, coaching, communities of practice, lesson study, mentoring, reflective supervision and technical assistance.[2]
 
        
             
        
        
        
The correct answer for this question is this one: "B. biologists and chemists."  A new drug to combat acne has been developed from a compound that is found in a melon. The <span>scientists would contribute to the development of the drug are biologists and chemists.
</span>
Here are the choices:
A. <span>chemists only
B. biologists and chemists
C. biologists, chemists, and physicists
D. biologists, chemists, and physicians</span>
        
                    
             
        
        
        
Answer:
-occurs at the intersection of columns and  rows
-is a single unit for entering data on a  spreadsheet
-is located according to its cell reference or  cell address
Explanation:
A cell is a box in a spreadsheet program that contains information and each cell is identified using a cell reference that indicates the colum letter followed by the row number where the cell is located. So, according to this, the characteristics of a cell in a spreadsheet software are: 
-occurs at the intersection of columns and  rows
-is a single unit for entering data on a  spreadsheet
-is located according to its cell reference or  cell address
 
        
             
        
        
        
Answer:
WiFi
Explanation:
WiFi is a standard wireless network configuration developed by IEEE (Institute of Electrical and Electronics Engineers) as a 802.11 standard. 
WiFi is embedded in chips in computers and configured for finding wireless routers. WiFi certified points can identify each other, this standardized networks are available almost all online electronic devices.  
Wi-Fi Alliance is the authority to certify devices which satisfy the IEEE 802.11 standards.