The bone that is attached to the eardrum is called the ; the bone that is connected to the oval window is called the hammer (malleus); stirrup (stapes) anvil (incus); stirrup (stapes) hammer (malleus); anvil (incus) stirrup (stapes); hammer (malleus)

hammer (malleus); stirrup (stapes)

Explanation:

Middle ear lies between eardrum and oval window. It transmits sound from outer to inner ear. It has three bones: hammer (malleus), anvil (incus) and stirrup (stapes).

Eardrum vibrates due to sound waves. This vibration is transmitted further via the three bones of middle ear. They are arranged as hammer, anvil and stirrup starting from eardrum till oval window. Hence, hammer is the bone which is in direct contact with eardrum and stirrup is the bone directly connected to oval window. Oval window is a membrane that covers the entrance to cochlea in inner ear.

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.