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joja [24]
2 years ago
12

!!!!!!!!!!!!H-E-L-P!!!!!!!!!! How do index fossils help scientists establish how old rocks and other fossils are? In your answer

, include fossils in the same layer of rock, in a lower layer of rock, and in a higher layer of rock compared to an index fossil.
Biology
1 answer:
Artist 52 [7]2 years ago
6 0

Answer:

Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period. Index fossils are useful because they tell the relative ages of the rock layers in which they occur.

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You are given a 1 liter bacterial culture in exponential stage of growth. The generation time of the bacteria is known to be 30
nydimaria [60]

Answer:

Option-A

Explanation:

A bacteria divides by binary fission which divides a parent bacteria into the two daughter cells and generation time refers to the average time difference between two consecutive generations.

The bacterial cell grows by the exponential function that is by 2^{number of generation} x initial population of bacteria.

In the given question,

<u>Initial population</u>

the initial population of bacteria - 2x 10³ per ml

So per liter, the bacterial population will be 2 x 10 ⁶

<u>Generation time</u>

1 generation time of bacteria is 30 min.

so 5 hours will have- <u> </u>\frac{300}{30}= 10 generations

<u>New bacterial population</u>

Using formula<u>  </u>2^{number of generation} x initial population of bacteria

2^{10} x (2 x 10⁶)

= 1048 x (2 x 10⁶)

2048 x 10⁶

Thus, Option-A is the correct answer.

4 0
2 years ago
Since her stomach was removed, Mrs. Lopez has the most difficulty initiating digestion of: Since her stomach was removed, Mrs. L
Svetllana [295]

Mrs. Lopez has the most difficulty initiating digestion of proteins after her stomach is removed. The correct option is C.

Explanation:

When the stomach is removed due to complications such as in cancers the food eaten directly goes to intestine. Without stomach Mrs Lopez will have difficulty in starting the digestion of protein.

The digestion of protein takes place and starts in the stomach and duodenum of intestine. There are enzymes as pepsin, trypsin and chyomtrypsin secreted  by stomach and pancreas. Pepsin breaks the peptide bonds of protein.

The HCl and the enzymes in stomach initiates the process of digestion of protein. The amino acids formed are ardent in various metabolic processes and repair.

lipids and carbohydrate digestion starts from the mouth only as salivary amylase and lipase initiates the process.

7 0
3 years ago
The group that has elements with the outer energy level filled is called the.
Nezavi [6.7K]
The Noble Gases. The Noble Gases is a(n) group on the periodic table of elements that contains elements that have full valence electron shells. Because of this, the Noble Gases do not react with any other elements.
4 0
2 years ago
Two squirrel varieties (the Abert squirrel and the Kaibab
Katarina [22]

Answer:

B. Disruptive Selection

Explanation:

the population is divided into two distinct groups, or is disrupted so the gentics start to vary between the separted populations over time.

3 0
3 years ago
What advantage does the switch to sexual reproduction give the aphids?
romanna [79]
)Sexual reproduction maintains a constant level of variation in the population and requires less energy.
6 0
3 years ago
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