1answer.
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
aniked [119]
3 years ago
11

What is an index fossil?

Biology
2 answers:
QveST [7]3 years ago
6 0
Used to define and identify geological times.<span />
dimulka [17.4K]3 years ago
3 0

Answer:

A fossil found in rocks from one time period

Explanation:

An index fossil is an fossil of an organism which lived at only one time during the evolutionary history. The index fossils are useful since they are only obtained from rock of one particular evolutionary time zone.  Restricted presence of index fossils represents the fact that they lived during a relatively brief period of geologic history. These fossils are used for dating and correlating the various time zones of evolutionary history

You might be interested in
A scientist finds an unusual living thing and decides to study it.
Nadusha1986 [10]
Has to be c















daaaaaaaaaaaaaaaaaaaaaaaaaaaaa
7 0
3 years ago
A father has two copies of a lactose persistence allele , he is homozygous dominant. The mother has one copy of that allele , sh
Contact [7]
The answer is C. ( use Punnett squares)
8 0
3 years ago
Read 2 more answers
The digestive and excretory systems
hammer [34]

THE EXCRETORY SYSTEM

Answer: The attachment shows the nephron which is the functional unit of the kidney.

It does the work of urine formation through 3 distinct processes.

-Ultra filtration( Small molecules are forced out of the selectively permeable membrane of the glomerulus into the Bowman's capsule under regulated pressure.these molecules are from the blood in the glomerulus brought in by the afferent arteriole.

- Selective reabsorption ( Useful molecule and iron such as glucose and sodium are reabsorbed back into the blood as the filtrate flows through the tubule(nephron)

-Tubular Secretion. ( Movement of molecules not filtered by the glomerulus during the initial stage of filtration back into the filtrate through the renal capillaries.

Stella's urine sample shows the presence of large protein (ULTRAFILTRATION)

John's blood test report indicates a high toxin level ( ULTRAFILTRATION AND TUBULAR SECRETION)

Miguel's blood test shows an increase in metabolic waste( ULTRAFILTRATION AND TUBULAR SECRETION)

Janice's urine report shows the presence of vital materials ( SELECTIVE REABSORPTION).

8 0
4 years ago
Genetic drift is dependent upon which of the following? A. crossing-over B. random chance C. natural selection D. gene mutation
sammy [17]

C. natural selection.

This is because in smaller populations the more that two separate groups of animals don’t interbreeding the father they become until speciation occurs where they cannot interbreed between the two groups.

7 0
3 years ago
Read 2 more answers
explain how an enzyme works using the terms catalyst, enzyme, active site, substrate, and product please.
dusya [7]

Answer: The enzyme or the Catalyst works by combining with its substrate in the activation site and converts it to Products.

5 0
3 years ago
Other questions:
  • PLEASE HURRY YOU WILL GET 99 POINTS explain how musculs are effected in space and what's inporten of international space
    8·2 answers
  • The most direct effect of severing the corpus callosum would be that
    8·1 answer
  • Which statement is true about scientific questions?
    6·1 answer
  • Heart attacks
    8·1 answer
  • An autoimmune problem involving the thyroid gland. Hyposecretion of growth hormone. Hyposecretion of the pancreas. Hyposecretion
    14·1 answer
  • Prokaryotic cells reproduce by?
    13·1 answer
  • PLS HELP <br><br> Explain how a compound microscope allows you to see magnified images.
    12·2 answers
  • The living organism found within an ecosystem
    7·1 answer
  • Different members of the same species are geographically isolated for many generations. What will likelyhappen to the population
    6·1 answer
  • How do changes to genes affect the traits of an organism
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!