1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lelu [443]
3 years ago
9

What was the Cretaceous tertiary extinction attributed to what major events that triggered the extinction of dinosaurs

Biology
1 answer:
vfiekz [6]3 years ago
7 0

Cretaceous extinction also known as Paleogene extinction was a period of time when suddenly around three quarter of the animal and plant species began to get extinct from the land. The event happened around 66 million years ago and is considered as the end of cretaceous era that lead to the beginning of Mesozoic era.

Reasons for the mass extinction:

  • Scientists think that a major asteroid or comet hit the surface of earth which deteriorated the earth’s environment, especially by making it difficult for plants to perform the process of photosysnthesis. This is called as Impact hypothesis and scientists think that it was the reason of extinction of so many species because they found debris of asteroid in the land.
  • There could also be some other reasons like climate changes,volcanic eruptions and changes in the sea level which made the environment unfavorable for the survival of living organisms.
  • One of the best known organism that is thought to extinct in cretaceous period was dinosaur.

Extinction of Dinosaurs:

As stated above the exact cause of dinosaur extinction can not be stated with confidence. This is because cretaceous period was the time when so many unfavorable circumstances took place like diseases,  geologic events ,climate change etc.

However, the most believed theory is that some Asteroid hit the surface of earth and turned the climate very very old. Therefore, those amazing creatures were not able to survive that climate.


Hope it help!


You might be interested in
What definition goes with what cell?
snow_tiger [21]

━━━━━━━☆☆━━━━━━━

▹ Answer

<em>See below.</em>

▹ Step-by-Step Explanation

Genes - parts of the DNA which control the traits of an organism

DNA - molecule that carries the genetic instructions for all living organisms. Found in the chromosome.

Nucleus - stores the cell's hereditary material or DNA

Chromosomes - Thread-like structures that are found in the nucleus of a cell that contains DNA.

Hope this helps!

- CloutAnswers ❁

Brainliest is greatly appreciated!

━━━━━━━☆☆━━━━━━━

8 0
3 years ago
What category do the individual organisms we can see with our naked eye fall in to?
Pani-rosa [81]

The Eukarya domain.

The organisms can be divided into three domains, based on the type of cell that the organism is made of:

<span><span>Bacteria domain: cells do not contain a nucleus.
</span><span>Archaea: cells don't contain a nucleus and they have a different cell wall from bacteria.</span><span>
Eukarya
: </span></span>They keep their genetic material inside the nucleus. Composed by animals, protists, plants and fungi


5 0
3 years ago
What type of farming uses monocultures of trees or shrubs? les​
Vitek1552 [10]

Answer:

commercial plantation

4 0
2 years ago
2. Suggest two ways that reflex reactions help maintain homoeostasis in the human body.
Nata [24]
<span>One reflex reaction to maintaining homeostasis in the body is shivering. In response to cold temperatures, the muscular system moves our muscles quickly to warm them up as a rapid, short term solution for homeostasis. Another example is the withdrawal reflex, which occurs as a response to pain. Pain receptors activated by the painful stimulus activate the motor neurons in the body, which in turn contract muscles to move parts of your body away from the pain.</span>
7 0
3 years ago
Which cell is most important for the defense against parasitic organisms ?
Murljashka [212]

I'd say, ina general way, that the most imporant cells in defense against parasitic organisms are definitely white blood cels, the cells responsible for defeating antigens, pathogens and deseases.

Although these might be the most important ones in that specific task (defending against parasitic organisms), all the cells in the immune system, along with other non-cell things are important, since they all play a specific role indispensable in our immune system.


Hope it helped,


BioTeacher101

8 0
3 years ago
Other questions:
  • Does active transport describe diffusion
    10·1 answer
  • What controls a tropism?
    5·2 answers
  • What enzyme is coded for in the chromosome of bacteria
    14·2 answers
  • The structure seta of the sporophyte performs which of the following functions?
    12·1 answer
  • can be used by cells to store energy, form biological membranes, and serve as chemical messengers. A) Carbohydrates B) Fructose
    8·1 answer
  • The _________________ are new substances that are created following a chemical reaction.
    13·2 answers
  • Tell me a little about prokaryotes and eukaryotes. What do these types of cells have in common? How are they different?
    7·2 answers
  • What is the function of mitochondria in cells
    13·1 answer
  • How does human population growth affect the environment?
    7·1 answer
  • What group is the first species to arrive in ecological succession?
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!