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
AnnZ [28]
3 years ago
6

This is 7th grade science plz help

Biology
1 answer:
Darya [45]3 years ago
4 0
The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite. From the fragments, scientist calculated the relative abundances of elements that formed as radioactive uranium decayed over billions of years. 
You might be interested in
A woman who is a carrier for colour blindness (X-linked recessive) has children with a man who has normal colour vision. A. What
viva [34]

Answer:

Explanation:

The Genotype of the  woman is XCbXN

The man XNY

Since the allele for the color blindness is carried on one of the X -chromosomes of the  carrier mother, then  the male children will be color blind or carrier deopending on the defective gene they inherited. Since they will receive the defective or normal  allele from the  mothers,but the female will carriers or normal because they will inherit either defective allele or normal allele from the mother,but normal  X allele from the father.

Assuming the colorbind gene was inherited by One of the boys, and the girls take the defective genes

1. XNY vs XCbXN.Then the one of the  boys will be colorblind  and the one of  girls will be carriers. XNXCb, XNXN, XCbY,XNY  50 %

2.If the two boys take the effective genes from the mothers. and none of the girls take the defective alelle

Then the two boys will be colorblind and the girls will be carrries XcbY,XcbY and XNXN XNXN.(normal girls).

The proportions that will be  the females  since the girls can only take the defective allele from one of the normal and defective allele from the mother. Assuming the girls  take the defective allele from the mothers and take normal from the father,they will all  be carriers,since the X of the father is normal.

They can not have a color blind girl.Since the father is normal It takes two colorblind X-chromosome to give a girl.

5 0
3 years ago
Which compound has the highest fuel value ? Why?​
Semenov [28]

Answer:

Hydrogen gas has the highest calorific value of 150 KJ/g among all the fuels. So, hydrogen gas is considered to be an extremely good fuel.

Explanation:

6 0
3 years ago
Read 2 more answers
Which statement explains a way that gymnosperm benefit from animals
miss Akunina [59]
The first person that answered is correct just to let you know!
6 0
3 years ago
Who do the animals in an ecosystem mainly acquire the sun' s energy
Marina CMI [18]
Animals likes the sun's energy. The sun supplies energy to plants to help them grow for animals. Animals eat the plants to get the energy they need.

Hope this helps!! ;))
Have a grat day!! <3
6 0
3 years ago
Nitrogen is an important element needed for plant growth. What living organism plays a big role in adding atmospheric nitrogen t
kompoz [17]
Nitrogen fixation, N2 --> NH3+, is not something that plants to by themselves but some plants have bacteria that does this. I believe that pea plants have these, but I'm not 100% sure. 
7 0
3 years ago
Other questions:
  • Suppose two independently assorting genes are involved in the pathway that determines fruit color in squash. these genes interac
    6·2 answers
  • The interstitial fluid is called the internal environment of the body because: a) Proper functioning of body cells depends upon
    14·1 answer
  • What holds cellulose molecules together in bundles large enough to form fibers?
    12·1 answer
  • What contains deoxytibose sugar
    13·1 answer
  • The w-4 form is completed by an individual when he or she first starts a new job. what does this form help to determine? brainly
    14·2 answers
  • #4) Why is DNA in the mitochondrial DNA known as "Eve's DNA"? *
    7·1 answer
  • Why wouldn’t the water cycle constantly adds pollution to the air be important in the water cycle
    15·1 answer
  • Why are genetic variation and selective breeding are advantages of sexual reproduction?
    8·1 answer
  • Carbon forms the basis of all of the following compounds except___?
    5·2 answers
  • Q1: What form of energy is this new animal sensitive to?*
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!