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
melisa1 [442]
3 years ago
9

Examine how photosynthetic prokaryotic cells changed the atmosphere of early Earth

Biology
1 answer:
romanna [79]3 years ago
4 0
They converted carbon dioxide to oxygen. The increased oxygen levels allowed for cellular respiration to occur instead of only glycolysis. The atmosphere became thinner, decreasing temperatures of the planet as well. 
You might be interested in
Hey can someone explain what happens in the "prophase" stage of cell division??
geniusboy [140]
During mitosis, the chromatin in the nucleus of a cell condenses and becomes visible under a microscope. The membrane around the nucleus breaks down.
8 0
3 years ago
How does chlorine form an ion
jolli1 [7]
When chlorine gains a electron or When a compound like hydrogen chloride is dissolved in water.
4 0
3 years ago
How does apoptosis prevent babies from being born with webbed fingers and toes
Anit [1.1K]

Answer:

In many organisms, programmed cell death is a normal part of development. In some cases, apoptosis during development occurs in a very predictable way: in the worm C. elegans, 131131131 cells will die by apoptosis as the worm develops from a single cell to an adult (and we know exactly which ones they are)^1

1

start superscript, 1, end superscript!

Apoptosis also plays a key role in human development. For instance, as we saw in the introduction, your hand started out as a paddle-like block of tissue when you were an embryo. The block was “carved” into fingers by apoptosis of the cells in between the developing fingers.

Microscope images from a scientific paper, showing a developing mouse paw. The cells between the developing digits are stained by a marker that indicates apoptotic cells.

Microscope images from a scientific paper, showing a developing mouse paw. The cells between the developing digits are stained by a marker that indicates apoptotic cells.

Image modified from "Duplication of digit 4 is preceded by reduced apoptosis and expanded chondrogenesis in the posterior limb mesenchyme," by Farin et al. ^2

2

squared, CC BY 4.0.

This process occurs in all sorts of vertebrate species that have finger- or toe-like digits, and less apoptosis results in more webbing between the digits. Sometimes, if a small mistake happens during finger or toe development, apoptosis may be incomplete (leading, for instance, to fused toes).

Other examples of apoptosis during normal development include the loss of a tadpole’s tail as it turns into a frog, and the removal of unneeded neurons in as neural circuits in the brain are “wired.”

Apoptosis can eliminate infected or cancerous cells

In some cases, a cell can pose a threat to the rest of the body if it survives. For instance, this may be the case for cells with DNA damage, pre-cancerous cells, and cells infected by viruses. If these cells undergo apoptosis, the threat to the rest of the organism (such as cancer or spread of a viral infection) is removed.

When a cell’s DNA is damaged, it will typically detect the damage and try to repair it. If the damage is beyond repair, the cell will normally send itself into apoptosis, ensuring that it will not pass on its damaged DNA. When cells have DNA damage but fail to undergo apoptosis, they may be on the road to cancer.

Explanation:

6 0
1 year ago
A ____________ (redox/synthesis) reaction is a reaction between at least two compounds in which a new, more complex compound is
FrozenT [24]

Explanation:

<em><u>synthesis</u></em>

<em><u>hope</u></em><em><u> it</u></em><em><u> helps</u></em>

<em><u>because </u></em><em><u>in </u></em><em><u>this</u></em><em><u> </u></em><em><u>reaction</u></em><em><u> </u></em><em><u>new </u></em><em><u>complex </u></em><em><u>compound</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>formed</u></em>

7 0
3 years ago
What is the compire between phylum and xyleom?
bagirrra123 [75]
Xylem Phloem are the vascular tissues that transport the food, minerals and water within the plant. Xylem transport the water and minerals while Phloem transport food and nutrients. The movements in Xylem is unidirectional from roots to aerial parts while the movements in Phloem are bidirectional.
7 0
3 years ago
Read 2 more answers
Other questions:
  • An organisms full set of DNA is called --?
    13·2 answers
  • __believed that as animals became more complex, so did their emotions
    6·1 answer
  • In cellular membranes, why do the tails ends of the lipid molecules face toward eachother?
    10·2 answers
  • If matter such as a piece of paper changes in size or shape it indicates that
    6·1 answer
  • When vitamin c intake is below 10 mg per day, the symptoms of _______ begin to appear?
    5·1 answer
  • Which type of contraction causes a skeletal muscle to shorten?
    15·1 answer
  • Positively charged sodium ions transport electrical impulses in the nervous system. Which subatomic particle does sodium lose to
    7·1 answer
  • Which of the following causes the change in seasons on Earth?
    12·2 answers
  • HURRY 30 POINTS) Look at the following diagram.
    15·1 answer
  • What best describes the role of carbon in the body?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!