answer.
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
andreev551 [17]
2 years ago
9

What effect did the increase in atmospheric oxygen by photosynthetic organisms have on Earth in terms of the geosphere?

Biology
1 answer:
notsponge [240]2 years ago
3 0

Answer:

hope it helps you❤❤❤

Explanation: But roughly 2.45 billion years ago, the isotopic ratio of sulfur transformed, indicating that for the first time oxygen was becoming a significant component of Earth's atmosphere, according to a 2000 paper in Science. At roughly the same time (and for eons thereafter), oxidized iron began to appear in ancient soils and bands of iron were deposited on the seafloor, a product of reactions with oxygen in the seawater.

Most important, how did the amount of atmospheric oxygen reach its present level? "It's not that easy why it should balance at 21 percent rather than 10 or 40 percent," notes geoscientist James Kasting of Pennsylvania State University. "We don't understand the modern oxygen control system that well."

You might be interested in
9. Look closely at the illustration above. a. What process is occurring? b. What is being made? c. How can you tell?
mars1129 [50]
The answers are:

A. DNA replication in the nucleus of a cell
B. From one helix of DNA in a replication process, we get two: The DNA is a double helix and it consists of two strands of specifically connected amino-acids. When the time for replication comes, a set of enzymes unwind the two strands and leave them as a base for additional two strands attaching to them - the green line is an example of that. The free nucleotides - adenine, guanine, thymine and cytosine are left open and the enzyme called DNA-polymerase helps to produce a new strand on the template of the old parental one (one of the blue ones in the picture) 
C. By the location on the smaller picture - replication takes place in the nucleus. And the most important hint are the letters A - adenine, G - guanine, T- thymine, and C-cytosine. A connects with T, and G connects with C. 
4 0
2 years ago
Sort the different barriers into their modes of reproductive isolation. A snail with a flat disc-like shell will not be able to
Stella [2.4K]

Answer/Explanation:

Types of reproductive isolation include: temporal, ecological, mechanical, and behavioural.

A snail with a flat disc-like shell will not be able to mate with a snail having a conical shell - this is an example of mechanical isolation, where the animals are physically unable to mate due to incompatible body shapes and sizes.

The reproductive organs of male bush babies do not match with the reproductive organs of females of other bush baby species. - this is another example of mechanical isolation, as the sexual organs will physically not allow reproduction between these species

The mating call of a cricket is not recognized by a cricket of other species - this is an example of behavioural isolation, which results from incompatible mating rituals. I.e. the animals do not respond to each others mating behaviours

The signals sent by a male firefly are not recognized by the female firefly of other species. - this is also an example of behavioural isolation.

Temporal isolation is where species cannot interact because they do not have the same mating seasons or are not active at the same type of day. ?Ecological isolation occurs when two species do not come into physical contact to one another because they access different areas of the habitat. E.g. mating zones, food sources or nesting sites.

8 0
2 years ago
Read 2 more answers
In order to beat, the heart needs three types of cells. describe the cells and their function.
yulyashka [42]
1. Rhythm generators (SA node)
2. Conductive cells (node cells)
3. Contractile cells (myocardial cells)
4 0
2 years ago
Mary and Jim used a streak plate to test pieces of the rock. They compared their results to a streak of limonite:
nataly862011 [7]

Answer:

The streaks made by the limonite are yellow, and the streaks made by Mary and Jim’s sample are brown. Therefore, they are not the same mineral. The rock is not made of limonite.

Explanation:

PLATO

4 0
2 years ago
Read 2 more answers
Which of the following is changed in a reaction by the action of an enzyme?
andrey2020 [161]
Well during an enzyme catalyzed reaction the enzyme bonds with a specific substrate at the active site. This is called an enzyme-substrate complex. The substrate is converted into a specific product, but the enzyme remains unchanged. Enzymes accelerate reactions by factors of at least a million.Enzymes are not used up in a chemical reaction. Usually, the enzyme will "reset" and be ready to use in another reaction. This is due to the fact that enzymes are proteins, and their shape is what they use in a chemical reaction. Initially, the enzyme has a particular shape. Something happens to the enzyme (usually a shape change, called a conformation change, brought on by the presence of two or more chemical reactants), and the enzyme catalyzes the reaction. After the reaction is catalyzed, the product is released, and the enzyme can "relax." This means it goes back to its normal shape, ready to do it all over again



Hope it helps
4 0
2 years ago
Other questions:
  • View the animation about getting into the fossil record, and write several sentences summarizing how a dinosaur can become a fos
    14·1 answer
  • What theme is featured in Machiavelli’s The Prince?
    13·2 answers
  • Which component is more medial: the right lung or the tracheal bifurcation?
    10·1 answer
  • A month after peter came in and was diagnosed with wnv, the physician at the urgent care facility noticed the presentation of si
    7·2 answers
  • Check all the ways listed below that ensure accurate reading of volume from a graduated pipette. tapping the base of the pipette
    15·2 answers
  • Which is *not* a kingdom in the Eukarya domain?
    13·2 answers
  • Rick’s class plans to study the effect of eating different breakfast foods on grades in morning classes. Students in the class w
    12·2 answers
  • Read about symbiosis using this link. Then answer the questions provided. Identify the type of symbiosis described. The saguaro
    14·2 answers
  • How can the finite growth multiplier be used to predict future values of population density, N(t) ?
    5·1 answer
  • 6. Many of the people suffer from the problem of acnes and feel annoyed of the ugly skin texture caused due to the acne spots. C
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!