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
vladimir2022 [97]
3 years ago
14

The universe has existed for approximately

Biology
2 answers:
Marysya12 [62]3 years ago
5 0
I think the answer is 13.7 billion years probably 
S_A_V [24]3 years ago
4 0
I believe the universe is 13.8 billion years old. Possibly longer, or possibly shorter. Correct me if I'm wrong. 
You might be interested in
Which type of organism is able to cause an infection
deff fn [24]
C. Bacteria 


Bacteria can cause you to get sick or even catch disease's   


Good luck! (:
7 0
3 years ago
Read 2 more answers
Consider two different traits in mice affecting tail length and fur color. A two-factor cross was made involving true-breeding m
Stells [14]

Answer:

See the answer below

Explanation:

Null hypothesis: The two genes are independently assorting and therefore, are not linked to each other.

Let A represents the allele for tail length and B for fur color. Long-tail A is dominant over short tail a while brown fur B is dominant over white fur b.

For the first cross involving true-breeding mice:

    AABB   x   aabb

F1         AaBb (long tails and brown fur)

For the second cross:

      AaBb   x   aabb

4 AaBb - Long-tail, brown fur

4 Aabb - Long tail, white fur

4 aaBb - short tail, brown fur

4 aabb - short tail, white fur

Since the phenotypic ratio from the cross is 1:1:1:1, if the null hypothesis was to be true, it means that the expected phenotype ratio should be 1:1:1:1.

In order to test this hypothesis, we use Chi-square:

phenotype                           O            E                 X^2  

Long-tail, brown fur           118          97.5        \frac{(118-97.5)^2}{97.5} = 4.31

Long tail, white fur              77           97.5             4.31

short tail, brown fur             81           97.5              2.79

short tail, white fur              114           97.5              2.79

Total                                                                          14.2

Degree of freedom = 4 - 1 = 3

Critical Chi-square value = 7.815

The calculated Chi-square value is more than the critical value, hence, the null hypothesis is rejected.

8 0
3 years ago
How does prokaryotic cell division differ from eukaryotic cell division?
dedylja [7]
Cell division is simpler in prokaryotes than eukaryotes because prokaryotic cells themselves are simpler. Prokaryotic cells have a single circular chromosome, no nucleus, and few other organelles. Eukaryotic cells, in contrast, have multiple chromosomes contained within a nucleus, and many other organelles.
5 0
3 years ago
The three major types of volcanoes are
Bess [88]
Shield, Cinder Cones & Composite Cones.
3 0
3 years ago
Temperatures in ponds and lakes vary by season.
olga2289 [7]
Yes the answer would be true
8 0
3 years ago
Read 2 more answers
Other questions:
  • Above is a bar graph showing how the average family uses water. Fresh water is a vitally important resource, and its supply is l
    8·1 answer
  • Proteins that resemble spools on which dna molecules are wound are called
    12·1 answer
  • How does cytoskeleton relate to something in every day life
    8·2 answers
  • How does the human body lever work?
    5·1 answer
  • Many feeding relationships that are linked together are called a
    7·1 answer
  • According to the diagram which of the following would be considered a vascular spore forming plant
    5·1 answer
  • How are organ systems like a city?
    5·1 answer
  • The main organelle for photosynthesis is the
    10·1 answer
  • Needing help with this.
    8·1 answer
  • What is meant by the "induced fit” of an enzyme?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!