The answer is choice C 50%
Neck length is what is going to change so that is the Independent Variable. The Dependent Variable is the Survival Rate.
Hope this helps
Your question has been heard loud and clear.
Lactobacillus is a type of bacteria that mainly occurs in fermented media like yoghurts and curds , but they are mostly present in our body and make up a part of our microbiome by being present in our digestive tracts , genital systems and urinary tracts , doing their job without harming us.
Thank you.