Which organisms were the earliest oxygen-producing life-forms?

earth worms

cyanobacteria

mold

Euglena

Answers

Answer 1

Answer:

cyanobacteria

Explanation:

just took the test


Related Questions

In meiosis a diploid cell divides twice yielding four haploid daughter cells. In meiosis I
what separates?
a) Old and new chromosomes
b) Sister chromatids
c) Parent and daughter DNA
Homologous chromosomes
D)homologous chromosomes

Answers

Answer:

D

Explanation:

let me know if thats right

In meiosis I, HOMO-LOGOUS CHROMOSOMES separate (Option D).

Meiosis is a type of reductional cell division by which a parent cell produces four daughter cells, which contain half of the genetic material.

Meiosis has two successive rounds of cell divisions: Meiosis I and Meiosis II.

In Meiosis I, homo-logous chromosomes line up at the equator of the parent cell (Metaphase I) and then segregate to different daughter cells (Anaphase I).

In conclusion, in meiosis I, HOMO-LOGOUS CHROMOSOMES separate (Option D).

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Please help me I’ll give what ever it’s called

Answers

Answer:

organ to organ system

Explanation:

i think it is C. i’m not entirely sure though

How do animals transport materials?

Answers

Answer:

Thought the process of discussion and ossmossis as due to gaseous exchange

Explanation:

With the aid of thin layers and large surface area animal are able to transport material thought the blood due to diffusion and osmosis In order to transport different materials from a every of high concentration to a low concentration until material is equally distributed throughout the body

As an electron approaches a proton, what happens to the electric force of attraction between them? (1 point) Group of answer choices Remains the same Increases Decreases It ceases to exist

Answers

Answer: increase

Explanation: cause ik

Answer: It increases

Explanation: As an electron goes near a proton, the force of attraction would increase. Electron is negatively charged while the proton is positively charged so they would naturally attract each other.

Hope this was helpful

The illustrations are models of cells and cell organelles.
Which model shows a prokaryotic cell?

a. I
b. II
c. III
d. IV

Answers

Answer:

b. ll

Explanation:

I took the quiz and got it right.

Image II shows a model image of a prokaryotic cell.

What is a cell?

A cell is a basic unit of life. There are two kinds of cells prokaryotic cells and eukaryotic cells.

Cells organize to form a tissue. Image II is of a prokaryotic cell. It is flagella.

Many prokaryotes have locomotory structures called flagella (plural: flagellum). A majority of protozoa and some bacteria move around. As opposed to motile bacteria, which solely use flagella to move, protozoa use cilia, pseudopods, and flagella to move.

Therefore, Image II shows a model image of a prokaryotic cell.

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In your own words explain how the structure of the cell membrane determines what can and cannot pass through the cell membrane.

Answers

Answer:

The cell membrane is semi-permeable. (or selectively permeable). The unique structure of the cell membrane allows small substances (like oxygen or carbon dioxide) to easily pass through.

Explanation:

The principal components of the plasma membrane are lipids (phospholipids and cholesterol), proteins, and carbohydrate groups that are attached to some of the lipids and proteins. A phospholipid is a lipid made of glycerol, two fatty acid tails, and a phosphate-linked head group.

Answer:

Explanation:

Because the cell membrane is a selectively permeable membrane it decides what it will allow to pass through the membrane wall and what will not

HURRY PLEASE HELP I REALLY NEED THE ANSWERS Briefly describe the three layers
of the mantle. Include
temperatures.
•Lithosphere:
•Asthenosphere:
•Mesosphere:

Answers

Answer:

lithosphere

Explanation:

is up of brittle crust and the top part of upper mantel and also the coolest and most rigid part of the earth

Answer:

Lithosphere:

The lithosphere is the rigid outermost layer of the earth known as the mantle and the crust. And it is defined by its rigid mechanical properties.

Asthenosphere:

This layer is highly viscous and is very mechanically weak and is located below the Lithosphere it is also known as the ductile region of the upper mantle.

Mesosphere:

The mesosphere is the third layer of the atmosphere, directly above the stratosphere and directly below the thermosphere. In the mesosphere, temperature decreases as altitude increases.

topo map ,30 points !!

Answers

Answer:

7. 440

8. 500

9.450

10. Hiker s had the steepest elevation and they elevated 50 meters

I am not quite sure what 11 is. I hope the other ones helped though srry

Explanation:

Answer:7. 440

8. 500

9.450 its been a while but this is what i got

Explanation:

PLEASE ANSWER QUESTION ON PICTURE!!!! BRAINLIEST FOR CORRECT ANSWER!!!!

Answers

What picture? I dont see any

Answer:

the picture???

Explanation:

:)

What is the purpose of RNA Translation

Answers

Answer:

this is how proteins are bound, through a series of amino acids combined in a chain

Explanation:

In general, evolution is ____ a
process of change.
A. Fast
B. Nonexistent
C. Slow

Answers

it’s c, the process of change is slow.

Answer:

In general it is  C. Slow

Describe each type of volcano. Shield volcano: Cinder volcano: Composite volcano:​

Answers

Answer:

Sheild Volcano-a broad domed volcano with gently sloping sides, characteristic of the eruption of fluid, basaltic lava.

Cinder Volcano-a broad domed volcano with gently sloping sides, characteristic of the eruption of fluid, basaltic lava.

Composite Volcano-a broad domed volcano with gently sloping sides, characteristic of the eruption of fluid, basaltic lava.

Explanation:

I had to learn these in 6th grade. Have a good day

A volcano is a crack in the crust of a planet, such as Earth, that enables molten lava, volcanic ash, and vapors to exit from a magma chamber beneath the surface.

Shield volcanoes: These are almost entirely composed of fluid lava flows. Flow after flow keeps pouring out in all orientations from a central summit vent, or group of vents, forming a broad, gently sloping cone with a profile similar to that of a warrior's shield. They are slowly built up by the accumulation of multitudes of highly fluid lava flows known as basalt lava, which spread widely over long distances and then cool as thin, gently dipping layers.

Cinder Volcano: The most basic type of volcano is a cinder cone. They are made of congealed lava particles and blobs ejected from a mono vent. When gas-charged lava is violently blown into the air, it splits into small fragments that consolidate and fall as cinders around the vent, forming a circular or oval cone. Often these cinder cones have a bowl-shaped crater only at the summit and rarely rise higher than a thousand feet above the surrounding terrain.

Composite Volcano: Some of the most majestic mountains on the planet are composite volcanoes, also known as stratovolcanoes. They are steep-sided, symmetrical cones with large dimensions made of varying thicknesses of a lava flow, volcanic gases, cinders, blocks, and bombs that can rise up to 8,000 feet above their bases.

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Pls help me , if I get this right I get a A

Answers

The picture you provided is a blank black screen.

Which process uses proteins to move molecules against a concentration gradient?

A. Passive Transport
B. Active Transport
C. Hypotonic
D. Endocytosis

Answers

It would be B. Active Transport

help I have 10 minutes this is a huge gradeeeeeee

Answers

Answer:

1. Volume

2. Mass

3. Units?  Metric System? I'm not sure about this one

4. Liters

5. Kilograms

6. Meters, but I'm pretty sure its the whole metric system

Explanation:

I have to go back and look at questions 3 and 6.

Hope I helped :)

Students were studying a graph showing the phase changes of a substance. The graph is shown below. Which statement best describes the data shown?

Answers

Answer:C

Explanation:P shows a increase of kinetic energy and a phase change from solid to liquid

The deer tick attaches to a warm-blooded animal and feeds on its blood.
Ticks need blood at every stage of their life cycle. They also carry Lyme
disease, an illness that can cause joint damage, heart complications, and
kidney problems What type of relationship is this?
Mutualism
Commensalism
Predator Prey
Parasitism

Answers

Parasitism. Ticks are complete parasites with no regard for the well being of their carriers.

What shape is the sugar in a nucleotide?

Answers

Answer:

In double-stranded DNA, the molecular double-helix shape is formed by two linear sugar-phosphate backbones that run opposite each other and twist together in a helical shape. The sugar-phosphate backbone is negatively charged and hydrophilic, which allows the DNA backbone to form bonds with water.

(50 points)The picture is a cross section of a bone.

A cross sectional view of bone. X points to the inner layer. Y points to the middle layer.

Which structures of the bone are indicated by the arrows?

A. X-compact; Y-spongy
B. X-spongy; Y-marrow
C. X-spongy; Y-compact
D. X-marrow; Y-spongy

Answers

Answer:

it is b X-spongy; Y-marrow, i am doing the test, and the other person is correct.

Explanation:

The arrows point to the bone formations called X-marrow and Y-spongy. So, the correct option is D.

What are Compact and spongy bones?

Osteons or haversian systems are tightly packed together to form compact bone. The osteon is made up of concentric circles (lamellae) of matrix surrounding a central canal known as the osteonic (haversian) canal. The bone cells (osteocytes), which are situated between both the rings of matrix, are found in regions known as lacunae.

The bone marrow stores fat and produces blood cells. Spongy bone, also known as cancellous bone, is composed of tiny, needle-like bone fragments organized in a honeycomb pattern. Bones that are more flexible can still be strong while weighing less. In the given example, the arrows indicate to a X-marrow and Y-spongy bone structures.

Therefore, the correct option is D.

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9) List these biomes in order from the greatest to least diversity (temperate
deciduous forest, tropical rain forest, temperate rain forest).

Answers

Tropical rainforest, temperate deciduous forest, temperate rainforest

I'm not too sure if the temperate forest is more diverse than the rainforest, so sorry if I'm wrong. Tropical rainforests are the most diverse because of the humidity, which is water. The water helps the soil stay healthy, which makes more plants, which makes more animals and insects.

I hope this helps! Good luck!

The biomes in order from the greatest to least diversity will be tropical rainforest, temperate deciduous forest, and temperate rainforest.

Tropical rainforests refer to the rainforests that occur in areas that have no dry season.

The temperate deciduous forest refers to a biome that always changes. It has seasons such as winter, spring, summer, and fall.

Temperate rainforest refers to the broadleaf or coniferous forests that receive heavy rain. This condition supports ferns, shrubs, etc.

It should be noted that the biome with the greatest diversity is tropical rainforest while the least is the temperate rainforest.

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How many moles are in 15 grams of Lithium?
2.16 grams
104.1 moles
2.16 moles
104.1 grams

Answers

There are 2.16 moles of lithium in 15 grams. Look at the periodic table to find the molar mass.

In which calluses did the new gene insert an existing corn gene?

Answers

Answer:

Many farmers use chemical herbicides to kill weeds and

insecticides to kill insects. Using genetic engineering, scientists

have developed ways to resist harmful crop pests. In this Gizmo,

you will use genetic engineering techniques to create genetically

modified corn.

Explanation:

Many farmers use chemical herbicides to kill weeds and

insecticides to kill insects. Using genetic engineering, scientists

have developed ways to resist harmful crop pests. In this Gizmo,

you will use genetic engineering techniques to create genetically

modified corn.

Cells genetically unique is it mitosis or meisis

Answers

Answer:

Meiosis

Explanation:

While mitosis makes two identical cells with the same numbers of chromosomes, meiosis makes four unique daughter cells, from which every cell has half of the number of the chromosomes as the parent cell.

Meiosis is the specified form of cell division, making the reproductive cells, like sperm and egg cells, for example.

8. The heart is considered to be a part of which of the two systems listed below? A circulatory and integumentary C circulatory and muscular B respiratory and muscular D skeletal and circulatory

Answers

I found this i hope it helps

About the Heart and Circulatory System

The circulatory system is composed of the heart and blood vessels, including arteries, veins, and capillaries. Our bodies actually have two circulatory systems: The pulmonary circulation is a short loop from the heart to the lungs and back again, and the systemic circulation (the system we usually think of as our circulatory system) sends blood from the heart to all the other parts of our bodies and back again.

What are the ecological roles of annelids?
ANSWER ASAP!
I’ll mark you as brainliest..

Answers

Answer:

The most important function of annelids, or earth worms, to their ecological environment is to turn over the soil, making it healthier for plant life. This is accomplished both by their burrowing habits and through eating and excreting dirt.

Explanation:

the most significant ecological role played by annelids is reworking of soil and sediments. ... Soils may harbor 50 to 500 earthworms per square meter; they keep soils aerated, and their castings fertilize the soil.

Study the map of major bodies of water in the United
States
Major Lakes of the US
What does the map indicate about fresh water in the
United States?
O The Southeast gets fresh water mainly from the
Mississippi River.
The Pacific Northwest is far from any access to a
fresh water supply.
The North has a large supply of fresh water, due to
access to the Great Lakes.
O The Northeast does not have access to much fresh
water, due to the lack of a major river system.
wiece

Answers

Answer:

The answer is c) The North has a large supply of fresh water, due to access to the Great Lakes.

Explanation:

Hope this helps! And I got the answer off Edg 2020 so It might only work on there.

Answer:

c

Explanation:

Students studying the workings of the kidneys completed an investigation. The students prepared four model cells by using dialysis tubing containing the same solution of blue dye and water. Each of the model cells originally had a mass of 10 grams. The students then placed each model cell in a beaker containing different concentrations of dye in water. After 24 hours, they recorded the mass of the model cells. Their data appears in the table.

Concentration of Water % Mass of Model Cell (g)
100 12
90 11
80 10
70 9

What is the most likely reason that the model cell placed in 100% water increased in mass?
Water reacted with chemicals in the model cell.
All of the water of the model cell evaporated.
Only half of the water entered the model cell.
Water diffused from the beaker into the model cell.

Answers

Answer:

Water reacted with chemicals in the model cell.

Explanation:

hope it helps

main parts of the male reproductive organ and their functions.....​

Answers

Answer:

penis

Explanation:

sex

What is the difference between glucose and ATP?

Glucose is a storable form of energy, while ATP is a usable form of energy.

ATP is a storable form of energy, while glucose is a usable form of energy.

ATP is only a usable form of energy, but glucose can be used and stored.

Glucose is only a storable form of energy, but ATP can be used and stored.

Answers

The main difference between glucose and ATP is that Glucose is a storable form of energy, while ATP is a usable form of energy.

Glucose is storable form of energy because it can't be used as energy until it can be broken down by mitochondria of the cell while on the other hand, ATP is the usable form of energy which we can get from the break down of glucose molecules. Our cells use ATP as a fuel to do various activities of the cell so we can conclude that in glucose, energy is present in stored form whereas ATP is used as energy in various activities.

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Simple Dominance is also known as...?



incomplete dominance


genetic dominance


complete dominance


forever dominance

Answers

Answer:

genetic dominance

Explanation:

Simple Dominance is also known as genetic dominance

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