Aristotle developed the first classification system and divided all known organisms into two groups:
plants and animals. He further divided the
animals into three smaller subgroups: land
dwellers, water dwellers, and air dwellers. What
question can be asked to highlight the problems
with this classification system?
A. Would all fish be classified into the same
subgroup, even though some live in lakes and
others in oceans?
B. Are penguins classified like other birds, even
though they don't fly?
C. Would two different breeds of dogs be classified
into the same subgroup?
D. How many animals can fit into each subgroup?

b.have there own function.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )

the principle of segregation describes how pairs of gene variants are separated into reproductive cells. from his data, mendel formulated the principle of segregation. we now know that the segregation of genes occurs during meiosis in eukaryotes, which is a process that produces reproductive cells called gametes.