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
Pepsi [2]
3 years ago
12

How a seashell becomes a fossil

Biology
1 answer:
Lynna [10]3 years ago
5 0
If the shell or bone is buried in sediment, it dissolves more slowly. Shells are preserved without being dissolved only when they are buried in sediments that consist of calcium carbonate minerals, like limestones. ... The most common fossils are shells of marine animals like clams, snails, or corals.
You might be interested in
Jackie and Kim are each holding one end of a rope. Jackie moves her end quickly up and down. The rope moves up and down, as show
Eduardwww [97]

Answer: A wave

Explanation: Waves move in that kind of up and down motion, a circuit is a straight line with energy flowing through it, a magnet is a pulling effect and a prism is a shape, not necessarily a motion.

Hope this helps ^_^

6 0
3 years ago
Which fruit has one seed with grooves on it?
Ronch [10]
<span>The answer is c. peach or nectarine

A peach</span> has only one seed. Its seeds have grooves around it.

Banana has many seeds although very small to notice. A cherry has one or two seeds but it does not have grooves on it. An orange seed has grooves on it but there are a lot of them in one fruit.
6 0
3 years ago
Which scientist proved the existence of a virus as a new type of pathogen?
Readme [11.4K]

Answer:

Dmitri Ivanovsky

Explanation:

Dmitri Ivanovsky utilized one of these filters in 1892 to demonstrate that despite being filtered, sap from a diseased tobacco plant remained infectious to healthy tobacco plants. The filtered, infectious substance was dubbed a "virus" by Martinus Beijerinck, and this discovery is regarded as the origin of virology.

6 0
2 years ago
Which of the following are characteristics of organisms in the Kingdom Plantae? *
GaryK [48]
Kingdom Plantae includes all the plants on the earth. They are multicellular, eukaryotes and consist of a rigid structure that surrounds the cell membrane called the cell wall. Plants also have a green coloured pigment called chlorophyll that is quite important for photosynthesis.
8 0
3 years ago
Two autosomal genes, J and K, are 60 map units apart. You perform the following testcross: J K / j k x j k / j k. At what freque
Dmitry [639]

Answer:

  • J K / j k = 20%
  • j k / j k = 20%
  • J k / j k = 30%
  • j K / j k = 30%                

Explanation:

To calculate the recombination frequency, we have to know that 1% of recombinations = 1 map unit = 1cm. And that the maximum recombination frequency is always 50%.

The map unit is the distance between the pair of genes for which every 100 meiotic products, one of them results in a recombinant one.

So, en the exposed example:

  • J and K are autosomal genes
  • J and K are separated by 60 M.U.
  • 60 M.U. means that there is 60% of recombination.

Cross)             J K / j k                    x                  j k / j k

Gametes) JK  Parental                                     jk, jk, jk, jk

                jk   Parental                                  

                Jk   Recombinant                          

                 jK   Recombinant

One map unit equals 1% of recombination frequency. This means that every 100 meiotic products, one of them is a recombinant one.

1 M.U. -------------- 1% recombination

60 M.U. ------------ 60% recombination

                              30% Jk  +  30% jK

100 M.U. - 60 M.U. = 40 M.U.

40M.U.--------------40 % Parental (Not recombinant)

                            20% JK   +   20% jk

Punnet Square)           JK       jk      Jk      jK

                          jk     JK/jk   jk/jk   Jk/jk   jK/jk

J K / j k = 20%

j k / j k = 20%

J k / j k = 30%

j K / j k = 30%                                

3 0
3 years ago
Other questions:
  • Which of these is an enviormental effect
    14·1 answer
  • Skin cells and liver cells contain different sets of enzymes which of the following conclusions can be made based on this inform
    11·1 answer
  • In what part of the cell is the protein molecule made and what structure is the site of protein synthesis?
    14·1 answer
  • What is a natural section
    6·2 answers
  • While sampling marine plankton in a lab, a student encounters large numbers of fertilized eggs. the student rears some of the eg
    13·1 answer
  • The invention of the microscope made it possible for scientists to _________. A. create new types of cells. B. examine and descr
    7·2 answers
  • People can breed cats for specific traits such as coat color through the process of _____.
    10·1 answer
  • Explain the steps of crop production
    11·1 answer
  • Asap i need help pls​
    10·2 answers
  • natural selection is an example of a mechanism of evolution. does this mechanism produce a change in individuals or populations?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!