BIOLOGY HIGH SCHOOL

Scientists were able to determine the age of the earth from rock samples that were analyzed.What technique was used to do this?

A.
fossil records <--- thats what i think

B.
radiometric dating

C.
extinction

D.
geologic time scale

Answers

Answer 1
Answer:

Answer:  B.  radiometric dating

Radiometric dating is an aging process which is used to age rocks and other objects associated with them. This is based upon the decay process of radioactive isotopes present in the rocks. The radioactive decay is the process in which an unstable  nucleus loses it's energy in the form of emerging radiation. The age of the typical rock is determined by the half life of the decayed products.

Answer 2
Answer: B. Radiometric dating. A method to determine absolute age.

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How does the structure of the membrane relate to its selective permeability? (think about the chemical properties of the inner core of the bi-layer.)

Answers

The cell membrane is also called selectively permeable membrane for its composition, it is composed of amphipathic lipid, protein and small amount of cholesterol which form a bilayer structure allow only specific substance.

What is cell membrane?

The cell membrane is a thin selectively semi-permeable membrane and act as an outer covering surrounding cell cytoplasm, Proteins and lipids are the major components.

The major  lipids are phospholipid, which form a semi-permeable lipid bilayer which have both hydrophilic or water loving head group and hydrophobic or water hating tail group and form bilayer structure.

Hence both group can interact with polar and non polar molecule individually called as amphipathic in nature, Some organelles like nucleus  and mitochondria also have its own cell membrane.

The proteins are peripheral, extrinsic and intrinsic type and the function of cell membrane is to protect the cell and maintain the structural integrity of the internal environment of the cell.

Learn more about cell membrane, here:

brainly.com/question/12476894

#SPJ2

.

The cell membrane is also called selectively permeable membrane for the sole reason being it is selective in nature.

It forms a physical barrier and as a barrier between the cell and the external environment as it allows only selected necessary molecules to pass through it and at the same time prevents entry of unwanted / unnecessary substances.

It also regulates the entry and exit of molecules into and out of the cell.

The cell membrane permits the entry of vital molecules like

water, oxygen, amino acids and glucose into the cell as they are crucial for various life processes and at the same time metabolic waste products are expelled through the cell membrane.

Question 20One commonly used precise way to describe concentrations of solutions is to state _____.

A)that the solution is dilute or concentrated

B)the percentage by area of the solute

C)the percentage by volume of the solute

D)the percentage by volume of the solvent

Answers

Answer:

The commonly used pieces to describe concentration of a solution is to state the percentage by volume of the solute. Hence the correct answer is option c.

Explanation:

A solution is said to be concentrated or dilute by the amount of solute and the amount of solution in it. A solution is defined as the mixture of solute into solvent. A solution is properly set if it is dilute or concentrated by seeing and observing it.

By defining the solution to its percentage volume that is calculated on the concentration of solute is the more precise method to tale about the concentration of the solution. This precise method can be used for many scientific experiments and further use.

A non-living component of a pond ecosystem would be called what?

Answers

Answer:

Water dirt and  sunlight and also soil and rocks

Explanation:

Its would be called water dirt, and sun, soil and include with rocks

What function does the nose serve in the respiratory system?

Answers

It helps you smell. Without it, how would you know if you liked something or not? It also plays a big factor in taste.
it is to notice the sense of smell 

What is dental decay?

Answers

Dental decay is when your teeth decay. Your teeth start to rot.
When your teeth rot.

Danny has taken a cross section of a seed. Which of the following are the parts that he will see?pollen grain, sperm, and egg

stored food, flower, and pollen grain

seed coat, stored food, and an embryo

cone, zygote, and seed coat

Answers

The right answer for the question that is being asked and shown above is that: "seed coat, stored food, and an embryo." Danny has taken a cross section of a seed. The follwoing parts that he will see is that of seed coat, stored food, and an embryo
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