21. Ang mga sumusunod ay kabilang sa mga klasikong
kabihasnan sa kanlurang Africa
maliban sa isa.
a. Ghana
b. Mali
c. Songhai
d. Zimbabwe​

D. Zimbabwe

Explanation:

Dahil hindi siya nabibilang sa kanlurang Africa

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.