Answer the following question given this paragraph: Primary Lymphoid Organs and Lymphocyte Development Understanding the differentiation and development of B and T cells is critical to the understanding of the adaptive immune response. It is through this process that the body (ideally) learns to destroy only pathogens and leaves the body's own cells relatively intact. The primary lymphoid organs are the bone marrow and thymus gland. The lymphoid organs are where lymphocytes mature, proliferate, and are selected, which enables them to attack pathogens without harming the cells of the body. Q: The primary lymphoid organs are the bone marrow and what else? Choices: - pinneal gland - thyroid - kidneys - thymus gland A:
thymus gland

Answer the following question given this paragraph: Q: Animal cells grow mainly by synthesizing protein-rich cytoplasm, a process that is described as expensive in what way? Choices: - calorically - synthetically - time spent - metabolically A:
metabolically

Answer the following question given this paragraph: There are also bacteria that use chemical processes to produce food. They get their energy from sources other than the sun, but they are still called producers. This process is known as chemosynthesis , and is common in ecosystems without sunlight, such as certain marine ecosystems. Q: What is the process in which producers get their energy from sources other than the sun? Choices: - electrolysis - phototropism - biosynthesis - chemosynthesis A:
chemosynthesis