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chubhunter [2.5K]
3 years ago
13

Which statement describes red blood cells? cell fragments needed for blood clotting liquid that transports nutrients defend the

body against disease transport oxygen and remove carbon dioxide
Biology
2 answers:
Anna71 [15]3 years ago
5 0
One of the characteristics of the red blood cells is transporting oxygen to the body tissues.
-Dominant- [34]3 years ago
3 0
The ans your are looking for would be d 

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Early scientists were conflicted about the mechanism by which cells were created, with some scientists holding the viewpoint tha
krek1111 [17]

Answer: All cells come from preexisting cells.

Explanation:

The given paragraph is about cells develop from the preexisting cells. The doubling of the genetic material in the S-phase is the triggering mechanism for cell division. In the process of mitosis the genetic material get reduced. The daughter cells vary by the amount of genetic material they receive. This proves that the new cells form from the pre-existing cells.

4 0
3 years ago
Both amphibians and reptiles…
White raven [17]

Answer:

<h2 /><h2>Both amphibians and reptiles...</h2>

A. have lungs

B. have gills

C. breath only through their skin

D. have amniotic egg

<h3>For me, my answer is letter B. have gills....Hope it helps</h3>

Explanation:

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8 0
2 years ago
How does weathering, deposition effect a hurricane
g100num [7]
Because the pressure of the rain is strong which affects the rain to become even stronger and forms a hurricane.
6 0
3 years ago
Record the stages of meiosis in eukaryotic cells realizing that there are two cell divisions involved, each having their particu
Leya [2.2K]
1.1
Meiosis I
The first meiotic division: diploid → haploid
    Prophase I: Chromosomes condense, nuclear membrane dissolves, homologous chromosomes join and occurs crossing over.
    Metaphase-I: the homologous chromosomes align in the middle of the cell. Spindle fibers from the centrosomes connect to the chromosomes.
    Anaphase -I: Spindle fibers contract and split the homologous chromosomes, moving them to opposite poles of the cell.
    Telophase -I: Chromosomes decondense; cell divides to form two haploid cells.

1.2 Meiosis II
The second division: separates sister chromatids (these chromatids may not be identical due to crossing over in prophase I)

     Prophase II: Chromosomes condense, nuclear membrane dissolves, centrosomes move to opposite poles (perpendicular to before)
    Metaphase-II:  the chromosomes align in the middle of the cell. Spindle fibers from the centrosomes connect to the chromosomes (at the centromere)
    Anaphase-II: Spindle fibers contract and split the sister chromatids, and moves them to opposite poles of the cell.
    Telophase-II: Chromosomes decondense,cells divides again to form another 2 haploid daughter cells. Final: 4 new cells.


2. The differences:
Mitosis:
- has 1 division per cycle
- one cell produces 2 new cells
- the genetic information in the mother-cell and the daughter-cells are the same. ( the number of chromosomes is also the same)
- it occurs in somatic cells
Meiosis:
- two divisions per cycle
- one cell when divides produces 4 new cells
- the new cells have different genetic information. mixes the genetic material from the parent cells
- the number of chromosomes of the daughter cells is half of the mother's.

3. Prokaryotic organisms don't divide through mitosis, they use a different process called binary fission. Only eukaryotic organisms, or those whose cells have a defined nuclei, undergo mitosis. Bacteria, for example, are prokaryotic organisms that use binary fission.

4.
 It can't occur. Cross over is the exchange of DNA between homologous chromosomes.  That will result in recombinant chromosomes during sexual reproduction. It can't occur on different chromosomes because they don't code for the same genes.

5. There are a lot of different theories about that, but it's mostly believed that meiosis must evolve before sexual reproduction. That's because The cell replicates their information first and then divides. Plus the cell does that even though it didn't recombine DNA with another organism (sexual reproduction).

3 0
3 years ago
What do you know about a gas's molecules?
Elena L [17]
Th molecules in gas move around without pattern, they aren't stationary like in a solid or patterned like in a liquid.
4 0
3 years ago
Read 2 more answers
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