Down;s syndrome is also known as trisomy 21 because it is caused by an additional copy of chromosome 21. The correct answer is the third one: 21st.
The continental drift affects living organisms in that it causes changes in climates which puts selective pressure on organisms, causes changes in habitats, including when large amounts of shallow marine habitat were lost in the formation of Pangea. Additionally continental drift may cause an increase or decrease in competition among different species and also it happens so slowly that it does not affect living organisms
Answer:
all cells comes from pre - existing cells
Explanation:
because cell comes are made up from living things
Answers:
1) bacteria
2) true
3)True
4)Virus
5)protozoa
6)false
7)helminths
8)true
9)Vaccinations
10)When you have the sniffles
11)true
12)false
13)direct
14)true
15)false
16)insects
