hello, 
endangered species are animal/species that are very likely to be extinct/gone.
another meaning: are in danger to be seriously in risk of being gone.
 
        
                    
             
        
        
        
Answer: a). AA
Explanation: Every trait is controlled by at least a pair of gene. Genes have different forms known as alleles. Alleles can be dominant or recessive. A dominant allele expresses itself in the presence of a recessive allele and masks the effect of a recessive allele. A recessive allele cannot express itself in the presence of a dominant allele and it's effect is masked by a dominant allele. Dominant alleles are usually written in upper cases such as A, T, while recessive alleles are usually written in lower cases such as a, t. The two alleles that determines a trait is called a genotype. A genotype can be homozygous if the two alleles are identical such as in AA or aa 
and can be heterozygous if the two alleles are not identical such as in Aa, Tt. 
 
        
             
        
        
        
Answer:
A) intensity of light
Explanation:
The independent variable is the thing being changed. A dependent variable is the effect caused by that change