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3 years ago

PLEASE HELP IM ON FINAL ATTEMPT!!!

Biology

2 answers:

allsm [11]3 years ago

5 0

Hope this helps :)

https://www.immunology.org/public-information/bitesized-immunology/cells/cd8-t-cells

ra1l [238]3 years ago

4 0

Answer:

The 4th one

Explanation:

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Before the presence of living organisms earth was a very different place match each fact about about Precambrian earth to the sp

Stolb23 [73]

The correct matches are:

- Atmosphere - Oxygen spilled into this sphere from ocean waters;

The majority of the oxygen in thee Precambrian Earth was not in the atmosphere, but instead it was in the ocean waters. With the emergence of life, large portions of this oxygen went into the atmosphere as it was released as a waste product.

- Biosphere - Cyanobacteria started to emerge as a life form;

The cyanobacteria were one of the earliest life forms. They were producers, and started to use the process of photosynthesis in order to produce food. The usage of this process caused lot of changes on the Earth later on.

- Hydrosphere - Oceans contained far less salt than they do today;

The rocks and minerals in the Precambrian Earth were not weathering and eroding in the manner they are now. Instead they were kept compact for much longer periods, influencing the mixture of of different components with the water as well in meantime.

- Lithosphere - Oxidation in rocks and minerals was not possible;

Because there was way to small amount of oxygen in the atmosphere, very close to 0%, the oxidation of rocks and minerals was not possible, as the oxygen is the gas that causes this process.

6 0

4 years ago

Which number identifies the system that serves as the site of nutrient and waste exchange between cells and the interstitial flu

Mrrafil [7]

The site for exchange nutrients and waste in capillaries.

Exchange of Gases, Nutrients, and Waste Between Blood and Tissue by diffusion Occurs in the Capillaries. Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them. They help to connect your arteries and veins in addition to facilitating the exchange of certain elements between your blood and tissues.

Plasma and interstitial fluid are very similar because water, ions, and small solutes are continuously exchanged between them across the walls of capillaries, through pores and capillary clefts.

Capillary walls contain small pores that allow certain substances to pass into and out of the blood vessel.

To learn more about capillary here

brainly.com/question/13251988

#SPJ4

5 0

2 years ago

In fruit flies, the allele for white eyes is recessive to the allele for red eyes. In a generation of fruit flies, 45 males with

Aleksandr [31]

1 is C - see first attachment. Genotypes with Y's represent males, and big R represents red eyes, while little r represents white eyes. For example XRxr is a heterozygous (red-eyed) female, and XrYr is a homozygous white-eyed male.

2 is B because the absence of functional proteins and some ribosomes due to the mRNA strand is not as detrimental as the loss of the entire cell.

3 is B. (The insertion of 3 base pairs into a genetic sequence is the length of a single codon, meaning that only one amino acid in the entire polypeptide was added)

7 0

4 years ago

discuss the states of matter that water can go through.Be sure to include the temperatures at which the changes take place.

Wittaler [7]

Solid- Ice: 0 degrees celcius

Liquid- Water: Room temperature

Gas-Steam: 100 degrees celcius

hope this helps :)

6 0

3 years ago

Help pleaseeeeee

Tcecarenko [31]

I think it’s 6
These six essential nutrients are nitrogen, phosphorus, potassium, magnesium, sulfur and calcium. The cool thing about these key nutrients is that they help create new cells, which then organize into plant tissue. Without these nutrients, growth and survival would not occur.

7 0

3 years ago