Answer:
The correct answer will be option- bone marrow.
Explanation:
Hematopoiesis is the process of the formation of the cellular components of the blood from the stem cells.
The cellular components are formed in the hematopoietic system which includes liver, bone marrow and spleen.
In infants, the blood cells are formed continuously from the liver, spleen and bone marrow but in adults, the blood cells are formed from the bone marrow mainly.
Thus, option- bone marrow is the correct answer.
Sexual reproduction:
Advantages: A species can evolve or adapt to changing environments, genetic diversity
Disadvantages: Time and energy needed to find a mate, requires both male and female gametes, one individual cannot reproduce
Asexual reproduction:
Advantages: Only one individual is needed to reproduce, doesn’t require time or energy to find a mate, can reproduce rapidly in good conditions
Disadvantages: No genetic variation, all of the offspring have the same weaknesses, can’t adapt or evolve
Answer:
On his visit to the Galapagos Islands, Charles Darwin discovered several species of finches that varied from island to island, which helped him to develop his theory of natural selection.
Darwin's finches are a classical example of an adaptive radiation. Their common ancestor arrived on the Galapagos about two million years ago. During the time that has passed the Darwin's finches have evolved into 15 recognized species differing in body size, beak shape, song and feeding behaviour.
Hydrogen bonds are bonds between a hydrogen in one polar molecule and the negatively charged end of another polar molecule. Hydrogen bonds allow two molecules to link together temporarily. Water molecules are made up of two hydrogen atoms and one oxygen atom, held together by polar covalent bonds.
