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oee [108]
3 years ago
7

How do index fossils help scientists?

Biology
1 answer:
krek1111 [17]3 years ago
5 0
Answer: Index fossils are used to identify layers of rocks. The layers will form an arrangement that relates to their age. In simpler terms, a layer that contains fossils are unique to that certain layer.
Index fossils are fossils that are mostly used by scientists due to it being easily found anywhere around the world and in abundant amounts. It can also be easily identified since they are fossils of widely varied organisms that lived during one short time period.
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What description best explains why viruses can become more pathogenic to host that were not affected by the virus before?
ANEK [815]

Answer:

New cells are naive to the infectious cells who attack it or they are not well prepared to deal with the different scenarios. But, the cells who are attacked before has the set or sequence of the viral or bacterial genome strand been identified by them, which leads to more safety or protection from these foreign bodies.

Explanation:

  • Mechanism To attack a host cell:

The viruses and other infectious material enters and attacks the host cell, by breaching its membrane wall and installing or leaving a gene of its own inside the cell. Which then combines with the genome of the cell and it goes through the process of replication, translation etc,along with the host cell machinery. Which then spreads the specific gene strand more in the environment

  • <u>Camouflage obtained by the infectious cell to hide it self:</u>

After the genome enters the host cell at first it does not recognizes the strands or foreign cells, as they cover there body with a camouflage sort of membrane and they look more like the body cells.

  • <u>Reactions by the host cell and as a whole the body:</u>

The organisms detects the genome of the infections cells or strand, as they store the data about it in its server or database. As if the next time they were under attack then precautions will be there by the host cell to deal with it.

As for the cell who are never attacked before will be less safe to deal with these foreign bodies.

5 0
3 years ago
What type of microscopy would you use to study the detailed internal structure of a mitochondria? A.Light microscopy B.Scanning
dolphi86 [110]

Answer:

C: Transmission Electron Microscopy

Explanation:

Transmission Electron Microscopy shows the complex internal membrane structure of mitochondria

6 0
3 years ago
Which fossil fuel is used to produce gasoline, jet fuel, diesel and plastics? it’s oil right?
V125BC [204]

Answer:

Crude Oil/Petroleum

Explanation:

Crude oil is a very versatile fuel and is used to produce things like plastics, artificial food flavorings, heating oil, petrol, diesel, jet fuel, and propane.

7 0
3 years ago
Read 2 more answers
1. Typically large organisms
ddd [48]

Large organisms include...

Mammals (Mammalia)

Stem-mammals (Synapsida)

Reptiles (Reptilia)  

Dinosaurs (Dinosauria)

5 0
3 years ago
Many pharmaceutical drugs specifically inhibit transcription in bacteria but not archaea or eukarya. why would drugs that inhibi
netineya [11]
Eu means true therefore it is known as eubacteria
5 0
3 years ago
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