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
AveGali [126]
3 years ago
13

What are 2 characteristics of index fossils?

Biology
1 answer:
Galina-37 [17]3 years ago
7 0
A useful index fossil must be distinctive or easily recognizable, abundant and have a wide geographic distribution and a short range through time. Index fossils are the basis for defining boundaries in the geologic time scale and for the correlation of strata.

hope this helps :)
You might be interested in
Please help ASAP, the first to answer will be marked Brainlyist. State one reason for the restriction of the construction of bui
Serggg [28]

Answer: cuz someone could get hurt while on the site

Explanation:

3 0
2 years ago
A researcher has developed two stains for use with seed plants. One stains sporophyte tissue blue; the other stains gametophyte
sukhopar [10]

Answer:

A) The pollen grains will be pure red.

Explanation:

Plants have alternation of generations, this means that there are two different stages in their life-cycle: a sexual haploid (n) phase and an asexual diploid phase (2n). These phases occur in different individuals, so there is an haploid plant called gametophyte that carries gametes and after fecundation, it will rise a diploid sporophyte (asexual).  

In seed plants, the sporophyte is the plant that we normally see, and the gametophyte is reduced into an organ of the sporophyte. The male gametophyte is the pollen that is produced in the sporangium in anthers (parts of sporophyte).  When a pollen grain fecundes a female gametophyte (egg), it will produce a diploid embryo or new sporophyte.

Therefore, if the researcher exposes pollen to both stains, these grain will stain red, because red stain identifies gametophyte tissue.

3 0
3 years ago
Difference between colloids and crystalloids
nordsb [41]
Crystalloids are aquous solution of mineral salts or other water soluble molecules 
colloids contains larger insoluble molecules such as blood and gelatin.



     hope it helps u....
4 0
3 years ago
The work of scientists usually beings with
Dmitriy789 [7]
Asking a question is usually what the first step is.
3 0
3 years ago
Read 2 more answers
How are elements related to the Earth's crust?
Goshia [24]
The answer is “B” “the crust composed of elements “
8 0
4 years ago
Other questions:
  • Which type of cells have a thick, mineral matrix in order to provide structural support? A. nerve cells B. blood cells C. sperm
    15·1 answer
  • A mutation occurs in the trp operon DNA of E. coli and results in the change to the two UGG tryptophan codons in the 5′ UTR of t
    11·1 answer
  • What layer forms the largest portion of the earth
    14·1 answer
  • In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert adp + pi to atp?
    5·1 answer
  • All of the factors below play a role in creating ocean currents. Which factor has the greatest influence on weather patterns?
    11·1 answer
  • An agricultural pest is best described as _____. any unwanted and destructive insect or other animal mosquitoes and other flying
    6·2 answers
  • Please help!!
    12·1 answer
  • Please help! I'm stuck and this is the last question.
    11·2 answers
  • A certain species of rabbit can have either black or grey fur. The allele for black fur is dominant over the allele for grey fur
    7·1 answer
  • Help me please I need to pass to be able to play <br> Earth and space btw
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!