Answer:
its A and D 
 
        
                    
             
        
        
        
Http://blogs.discovermagazine.com/seriouslyscience/2015/01/29/pandas-ancestors-ditch-meat-bamboo/
According to this study, it may have had to do with the deactivation (technically known as “pseudogenization”) of an umami taste receptor gene. Umami is the taste that makes things like meat, soy sauce, and mushrooms extra yummy. Apparently, at some point in panda evolution, the umami receptor became non-functional. Based on how much the gene has changed, the authors calculate that this happened around the same time that pandas started eating bamboo. Whether it’s cause or effect is unclear, although the authors think the switch to bamboo may have happened before the gene was lost. Regardless, the loss of the gene reinforced the panda’s vegetarian diet because it made meat less delicious to the bears.
Sorry it's a lot but hope it's useful
        
             
        
        
        
Vein because they have valves to prevent back flow of blood.
        
                    
             
        
        
        
Answer:
all of their children would have a widow's peak hairline
Explanation:
Chris's genotype consists of two dominant widow's peak genes and Janet has two recessive widow's peak genes so the each of the children will inherit one dominant and one recessive widow's peak genes from each parent, making them exhibit "v" shaped hairline and also being carriers for straight hairline.