Altostratus would be a mid level blanket cloud and cumulus would be cottonball, fluffy clouds
        
             
        
        
        
A X-rays I think this is the answer
        
                    
             
        
        
        
Answer:
Constant variables
Explanation:
Elaina's investigation lacked the critical ingredient of constant variables which are important components of every scientific investigation. In every research, there are 3 important variables, namely:
1. Dependent variables: the actual variable to be measured during the course of investigations and whose values are dependent on another variable (independent variable) supplied by the investigators.
2. Independent variable: one of the variables that are supplied by investigators whose values are often manipulated to see the kind of changes it will cause to the dependent variable. 
3. Constant variables: other variables that are neither independent nor dependent but constant for all the various experimental groups in investigations. 
 
        
             
        
        
        
Answer:
B. Meiosis I
Explanation:
In meiosis I, it starts with a diploid cell with a homologous chromosome pair. The crossing of genetic material between chromosome pairs also occurs in this stage. The alleles containing the same trait would get separated so a new combination of alleles can be produced.