Carbon is so abundant in living things even though oxygen is the most abundant element on Earth because carbon atoms can bond with one another to make chains and cyclic structures whereas oxygen atoms cannot form chains or cyclic structures.
The correct answer is the first option.
Answer:
Primary lymphoid organs: These organs include the bone marrow and the thymus. They create special immune system cells called lymphocytes.
Secondary lymphoid organs: These organs include the lymph nodes, the spleen, the tonsils, and certain tissue in various mucous membrane layers in the body (for instance in the bowel). It is in these organs where the cells of the immune system do their actual job of fighting off germs and foreign substances.
Also...
Bone marrow is a sponge-like tissue found inside the bones. That is where most immune system cells are produced and then also multiply. These cells move to other organs and tissues through the blood. At birth, many bones contain red bone marrow, which actively creates immune system cells. Over the course of our life, more and more red bone marrow turns into fatty tissue. In adulthood, only a few of our bones still contain red bone marrow, including the ribs, breastbone, and pelvis.
Answer:
C & D
Explanation:
Fibrous means many roots and tap root means one long root
A cultivated field with organic methods would expect to see greater diversity.
What Is Organic Farming?
Organic farming is an agricultural practice that makes use of biological pesticides and fertilizers derived from plant or animal waste. Actually, the practice of organic farming began as a response to the harm that synthetic fertilizers and chemical pesticides were causing to the environment. Or to put it another way, organic farming is a new type of agriculture or farming that improves, maintains, and repairs the ecological equilibrium.
Economical benefits of organic farming include: For the planting of crops, expensive fertilizers, insecticides, or HYV seeds are not necessary in organic farming. There is therefore no additional cost.
Learn more about Organic Farming here:
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Because alleles can be either dominant or recessive. For example eyes : brown dominant and blue recessive. The mom can have Bb which is dominant and recessive and the dad can have bb only recessive. There’s going to be a combination of alleles which leaves the outcome unknown. The offspring can inherit either: Bb or bb
