I am pretty sure that the actual answer hides in the question itself, therefore I'd choose the second option. According to the phrase "he more successful of the two", it definitely should be B. Competition.
As people age there one become more porous due to loss of calcium and phosphate and osteoporosis.
<u>Explanation</u>:
Osteoporosis is a condition in which the bones become brittle and easy to break on injury which results due to the loss of calcium from the bones. Many health problems and aging can lead to the disease of osteoporosis like breast cancer, prostrate cancer, depression, rheumatoid arthritis, Sickle Cell disease, Parkinson's disease, thalassemia, and many others.
The decreased density of the bone can be detected with the help of bone density x-ray. In females osteoporosis is common after menopause in which the drop of estrogen hormone levels cause the loss of calcium absorption in the bones.
I kind of think that's okay for a scientific observation on it's own, but I guess if I'm going by the pattern of the other answers I gave you, I'd make it more specific.
You can say anything to make it more specific (generally in science though, it's focused on what the experiment is about). So ideas that i think would work: something about the frequency of the chirp, how many times the bird chirped, the volume, the duration of the sound.
Explanation:
Enzymes are biological molecules (typically proteins) that significantly speed up the rate of virtually all of the chemical reactions that take place within cells. They are vital for life and serve a wide range of important functions in the body, such as aiding in digestion and metabolism...
