What does learn by trial and error mean? (
a. follow a routine established in the past (
b. practice the skills needed by mature animals (
c. watch others perform successfully and then mimic their actions (
d. test possible choices and then avoid ones that are not desirable

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- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic