Viruses, although not considered to be alive, attack host cells and cause disease. the attack of a host cell is necessary for the virus to survive for all of the reasons listed except one. that is
a) they cannot synthesize proteins because they lack ribosomes and must use the ribosomes of their host cells to translate viral messenger rna into new proteins.
b) they cannot produce or store energy in the form of atp and have to get their energy from the host cell.
c) they parasitize the host cell for basic molecules like amino acids, nucleotides, and lipids.
d) they lack dna so they must use the dna of the host cell

c. genetic engineering

explanation:

events in order:

1.       vishnu schist

2. zoroaster granite

3. bass limestone

4. hakatar   shale

5. igneous intrusion

6. shinumo quartzite

7. dox sandstone

8. tapeats limestone

9. bright angel shale

10. muav limestone

11. temple butte limestone

12. redwall limestone  

nonconformity

answer: the unkar group shows angular unconformity because the layers are turned at angle.

unconformity

answer: specifically the angular unconformity occurs between the cambrian and precambrian rocks. the dox sandstone, shinumo quartzite, hakatar shale, and bass limestone have been filled. an angular unconformity occurs between the cambrian and precambrian rocks. the dox sandstone, shinumo quartzite, hakatar shale, and bass limestone have been filled.

disconformity

answer: the disconformities aremarked irregular lines between the sedimentaryrocks layers.