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
WARRIOR [948]
3 years ago
10

What is thought to have caused the mass extinction at the end of the Cretaceous Period? A) global warming Eliminate B) an astero

id hitting Earth in Mexico C) extensive volcanic activity world-wide D) the start of glaciation and climatic changes
Biology
2 answers:
GalinKa [24]3 years ago
5 0

The answer is B. Geology has shown a thin layer of iridium (a rare mineral on earth but found on asteroids and meteors) in the rock layers between the Cretaceous and Paleogene periods. Below this layer are numerous fossils of  pterosaurs and dinosaurs, but above the layer are drastically few. The aftermath of asteroid impact is believed to have smothered most vegetation from earth which dinosaurs depended on as a source of food.  






kifflom [539]3 years ago
5 0

Answer:

B

Explanation:

You might be interested in
John is a smoker. he has at least doubled risk of which mental disorder?
Dafna11 [192]
<span>Schizophrenia This is a mental disorder characterised by failure to understand what is real and abnormal social behaviour . Studies across 20 countries have shown a strong link between smoking and schizophrenia .</span>
5 0
3 years ago
Ideally, diagnosis targets only specific elements of the organization. <br> a. True <br> b. False
Nookie1986 [14]
Yes it's true. i can explain it with very consiously but i am going to bed now 


6 0
3 years ago
Compare and contrast the contributions of Neel, Pauling, and Ingram to our understanding of the genetic and molecular basis of s
taurus [48]

He demonstrated that SCD and sickle cell trait were due to the presence of abnormal 8-globin polypeptides in red blood cells. He demonstrated that the electrophhoretic mobility of B-globin from patients with SCD was different from that of healthy individuals. He demonstrated that both parents of multiple patients with SCD had low levels of sickled red blood cells. He hypothesized that SCD was a recessive trait and that the parents of patients with SCD would be heterozygous carriers. He demonstrated that the difference between B-globin polypeptides in individuals who were healthy and those with SCD is an amino acid substitution. He performed a peptide fingerprint analysis on B-globin from individuals with 84 84 and 89 88, which identified the segment of B-globin that was changed by the BS mutation. James Neel Linus Pauling Vernon Ingram

hope it helps..

7 0
3 years ago
I would really appreciate it if someone can helpp!!!
skad [1K]

Answer: IM NOT SHORE but when you have to BB its 100% black and the parent of that one will pass on B always. the white mouse is bb this is a resistive trait.

Explanation:i hope i help  you sorry if it didnt but i tired my best

5 0
3 years ago
Consider a cell that requires much more ribose5‑phosphate than NADPH. The cell needs ribose 5‑phosphate but has a relatively hig
Sergio039 [100]

Answer:

The fate of glucose-6-phosphate,glycolytic intermediates and pentose phosphate pathways are described below

Explanation:

Fate of Glucose -6-phosphate

Glucose-6-phosphate undergo dephosphorylation to form glucose when there is an increase demand of glucose in the body.

Glucose-6-phosphate enters into pentose phosphate pathway to synthesize ribose-5-phosphate which is used during denovo pathway of purine nucleotide biosynthesis.

Fate of glycolytic intermediates

Glyceraldehyde-3-phosphate is an important intermediate of glycolysis.The glyceraldehyde-3-phosphate act as a precursor during lipogenesis that deals with the biosynthesis of triacylglycerol.

Fate of pentose phosphate pathway intermediates

Ribose-5-phosphate and NADPH are the important intermediates of pentone phosphate pathway.

 Ribose-5-phosphate act as a substrate molecule during the denovo biosynthesis pathway of purine nucleotides.

NADPH act as a reducing agent during fatty acid biosynthesis process.

4 0
3 years ago
Other questions:
  • Alexa has mixed four samples of soil. She is going to plant a tomato seedling in each one. Which soil should she use for the tom
    10·1 answer
  • A molecule used by cells to store genetic information
    6·1 answer
  • What do disaccharides, such as sucrose and polysaccharides such as starch have in common
    15·2 answers
  • Of the 65 million americans living with an incurable sexually transmitted infection, most of them have
    14·1 answer
  • Starlings are birds that feed off insects that are attracted to cattle. The starlings get food from the cattle, but the cattle a
    13·2 answers
  • What can be done to improve soil fertility?
    11·2 answers
  • A knife is an example of a(n) _______.
    6·1 answer
  • What are the structures found in a root hair cell of a plant?
    8·1 answer
  • Inhibiting enzymes involved in cell wall synthesis leads to which of the following? A) cell death by osmotic lysisB) a reduction
    7·1 answer
  • This is hard. pls help. Write an equation for cellular respiration. Write an equation for photosynthesis. How are these two equa
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!