Answer:
B. The animals at each level use energy, so only a small amount of their energy is available to the next level.
Explanation:
Diffusion is across a semi-permeable membrane. The larger the membrane, the longer the diffusion takes
B. <span>The thesis statement is the answer to the research question</span>
Allan already had a heart attack and can try to prevent another one by changing the diet, exercising, or even quit smoking, but there are non-modifiable risks such as age, sex and generic heritage, so If Allan is over 40 years old, male or comes from a family with heart diseases, Allan needs to be extra careful because those factors cannot be changed no matter how the way of life is changed.
