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
nevsk [136]
3 years ago
6

Help pls'll give brainlest

Biology
1 answer:
Harman [31]3 years ago
6 0
Here’s a jumping off point: atoms are the building blocks of molecules, molecules are the building blocks of cells. cells create tissues which create organs which create organ systems. organ systems of varying complexities are necessary for the function of organisms.
You might be interested in
What is lithosphere​
andre [41]

Answer:

Ask google

Explanation:

4 0
2 years ago
Read 2 more answers
Do all sperm look alike? What are some differences that sperm cells can have?
igor_vitrenko [27]

Answer:

The more different the human is between human sperm to the eggs might just look different that every sperm is different because of the way their inherited DNA.

yeh.....

3 0
3 years ago
PLEASE PLEASE HELP ME!!!! (10 POINTS!)
Oksi-84 [34.3K]

Answer:

 

en Espanol en Español     print print

Bottlenecks and founder effects

Genetic drift can cause big losses of genetic variation for small populations.

Population bottlenecks occur when a population's size is reduced for at least one generation. Because genetic drift acts more quickly to reduce genetic variation in small populations, undergoing a bottleneck can reduce a population's genetic variation by a lot, even if the bottleneck doesn't last for very many generations. This is illustrated by the bags of marbles shown below, where, in generation 2, an unusually small draw creates a bottleneck.

Loss of genetic variation as a result of a population bottleneck

Download this graphic from the Image library.

Reduced genetic variation means that the population may not be able to adapt to new selection pressures, such as climatic change or a shift in available resources, because the genetic variation that selection would act on may have already drifted out of the population.

Elephant seal

 

An example of a bottleneck

Northern elephant seals have reduced genetic variation probably because of a population bottleneck humans inflicted on them in the 1890s. Hunting reduced their population size to as few as 20 individuals at the end of the 19th century. Their population has since rebounded to over 30,000 — but their genes still carry the marks of this bottleneck: they have much less genetic variation than a population of southern elephant seals that was not so intensely hunted.

Founder effects

A founder effect occurs when a new colony is started by a few members of the original population. This small population size means that the colony may have:

reduced genetic variation from the original population.

a non-random sample of the genes in the original population.

For example, the Afrikaner population of Dutch settlers in South Africa is descended mainly from a few colonists. Today, the Afrikaner population has an unusually high frequency of the gene that causes Huntington's disease, because those original Dutch colonists just happened to carry that gene with unusually high frequency. This effect is easy to recognize in genetic diseases, but of course, the frequencies of all sorts of genes are affected by founder events.

Explanation:

7 0
3 years ago
A. What is likely to happen to coral reefs if atmospheric carbon dioxide
sveticcg [70]

Answer:

Coral reefs are under threat if atmospheric carbon dioxide levels continue to rise, new research has shown. When CO2 dissolves in the ocean, it raises the water's acidity level. This prevents a build up of calcium carbonate, which corals draw from seawater to build their skeleton

Explanation:

5 0
3 years ago
WILL BRAINLIEST What birds fly backwards forwards sideways and up and down all around? also will you be my friend'
algol13

Answer:

hummingbirds and yes i will

Explanation:

7 0
3 years ago
Read 2 more answers
Other questions:
  • What animals eat a robin
    5·2 answers
  • Which of the following statements is true?
    9·1 answer
  • What Part Of The Brain is Highlighted In The Diagram Below
    12·2 answers
  • What is biodiversity? Please explain. I’ll give literally anyone branliest...I NEED HELP ASAP!
    12·2 answers
  • Which molecule is a source of carbon, hydrogen, and oxygen atoms for making proteins?
    10·1 answer
  • Which group consists entirely of organic molecules
    7·1 answer
  • NEED HELP ASAP! Energy in a Carbohydrate
    7·2 answers
  • (GIVING BRAINLIEST!!)
    14·2 answers
  • When blood vessels narrow, they help increase blood pressure. Thinking only about smooth muscle in the arms, you know that Selec
    10·1 answer
  • Bacteria, viruses, protists, parasites, and fungi can all cause disease and can be referred to as ______. antibodies macrophages
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!