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
navik [9.2K]
3 years ago
6

How do scientists know the CO2 levels going back over 400,000 years?

Biology
1 answer:
lidiya [134]3 years ago
6 0

Answer: Various proxy measurements have been used to attempt to determine atmospheric carbon dioxide concentrations millions of years in the past. These include boron and carbon isotope ratios in certain types of marine sediments, and the number of stomata observed on fossil plant leaves. 2 record of over 500 million years.

Explanation:

You might be interested in
a. What are the two genotypes of the grandparents? ________ b. What is the genotype of Jane's husband? ________________ c. What
Hitman42 [59]

Answer:

a. Rr, Rr

b. rr

c. 0% because its the women who transmits the disorder.

Explanation:

PKU allele is an autosomal recessive disorder which is caused by mutations in both alleles of gene for phenylalanine hydroxylase. Alleles are either dominant or recessive. When two alleles are identical means that mother and father cells are homoozygous recessive. They both are combining the same alleles causing it to have a higher chance of genetic disorder.

6 0
4 years ago
Help please AFSP HELP​
kiruha [24]

Answer:

I think the answer is B.

HOPE THIS IS RIGHT......

7 0
3 years ago
Read 2 more answers
The mass extinction occurring today differs from those that occurred in the past because
aksik [14]
<span>A.) it is due mainly to the actions of one species
</span>
4 0
3 years ago
Read 2 more answers
Which air pressure reading would be most likely during a clear, sunny day?
Effectus [21]

the answer is option D.

7 0
4 years ago
Plz help ASAP!<br><br><br> Which phrase best describes the dependent variable in an experiment?
Colt1911 [192]

Answer:

The value that depends on another.

Explanation:

The dependent variable is the variable being tested and measured in an experiment, and is 'dependent' on the independent variable. An example of a dependent variable is depression symptoms, which depends on the independent variable (type of therapy).

3 0
3 years ago
Other questions:
  •  Plants need nitrogen in order to survive. The problem is they cannot take in the atmospheric nitrogen, but instead must rely on
    12·1 answer
  • Which three processes are methods of genetic recombination?
    10·1 answer
  • When organisms attempt to use the same resources
    10·1 answer
  • Nutrients your body needs are
    11·1 answer
  • The internal environment of a house is to thermostat as the human body is to
    9·2 answers
  • The fact that some people in the advanced stages of aids experience neurological damage that results in psychological abnormalit
    7·1 answer
  • A low secretion of luteinizing hormone (LH) in the normal male adult would cause
    13·1 answer
  • Cellular division involves the redistribution of the nuclear material, or DNA, as well as the cytoplasm and organelles. During w
    6·1 answer
  • 1) What is the full form of RBC and WBC ?​
    5·2 answers
  • If a cell stains dark for the sdh test and light for the matpase test, how can we classify that cell?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!