The amount of material left after 2 half-lives is one half of the original amount true or false

It is false that the amount of material left after 2 half-lives is one half of the original amount.

Explanation:

The time taken by half of the nuclei to decay is called as half-life. Initially half of the nuclei are decayed in first half life and for the next half life again the half of remaining original nuclei decays.

In this way in the second half life the original material has fewer amounts than one of the original amount.

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.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .