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
emmainna [20.7K]
3 years ago
12

4. 5 .The natural population replacement fertility rate in the U.S a) 2.1 births per woman b) 3.9 births per woman c) 3.1 births

per woman d) 4.2 births per woman The rate at which new disease or mortality events will occur in a population in a given period of time. a) The biological gradient
Geography
1 answer:
Slav-nsk [51]3 years ago
5 0

a) 2.1 births per woman

You might be interested in
What part of the hydrosphere penetrates the lithosphere?
Andrei [34K]

Answer:

groundwater

Explanation:

7 0
2 years ago
Which sentence best represents the relationship between the process of subduction and the rock cycle
Citrus2011 [14]
Where are the sentences?
6 0
2 years ago
Read 2 more answers
Why some people don't have houses to stay in?
inna [77]
Cause they can't afford a house they don't have enough money for it hope this helps
4 0
3 years ago
Read 2 more answers
When did farming methods spread to Europe?​
juin [17]

Answer:

An analysis of 5,000-year-old genetic material from preserved human remains found in Sweden suggests that people moving from southern to northern Europe spread agriculture across that continent long ago.

In addition to agricultural know-how, the intrepid farmers brought their genes: They interbred with hunter-gatherer communities to create modern humans living in Europe today.

"Genetic variation of today's Europeans was strongly affected by immigrant Stone Age farmers, though a number of hunter-gatherer genes remain," study researcher Anders Götherström, of Uppsala University in Sweden, said in a statement.

The results of this study, to be published in the April 27 issue of the journal Science, match up well with previous archeological evidence of farming in Europe.

Explanation:

hope it help to you

3 0
3 years ago
How do we know there is Dark Matter in other galaxies? a. it occasionally lum inesces b. flat rotation curves in spiral galaxies
lesantik [10]

Answer:

b. flat rotation curves in spiral galaxies

Explanation:

Dark matter accounts for majority of the matter in the universe (about 85%). It is considered to be composed of subatomic particles which are yet to be discovered. Dark matter cannot be observed because it does not emit light that can be detected. Only its gravitational effect is visible.

Astronomers when calculated the mass of the visible matter and tried to account for the observed speed of stars in the galaxy, there was a mismatch. To understand what caused this mismatch, astronomers gave name to the invisible matter as the Dark Matter.  

The expected velocity of stars should decrease away from the near the center of the galaxy but a constant velocity of stars was observed that is a relatively flat rotation curve was obtained.  

Thus, flat rotation curves in spiral galaxies in an evidence of Dark Matter.

8 0
3 years ago
Other questions:
  • Human activity that has damage marine and coastal ecosystem
    9·1 answer
  • What is an important characteristic when determining what makes up a tectonic plate versus what makes up the layer beneath it?
    11·1 answer
  • What is the significance of parallels and meridians?
    5·1 answer
  • 25) Which of the following is not a sign of global warming?
    5·1 answer
  • ________ is an area where two tectonic plates move towards one another
    14·1 answer
  • What is the slow movement of land over the earth's surface is called
    7·2 answers
  • Two plant reproductive parts are described below.
    14·1 answer
  • How much salt can freshwater contain?
    6·1 answer
  • just wondering what this map is depicting that i saw on reddit i was thinking something to do with comunist country's but im not
    6·1 answer
  • What characteristics of Venus's<br> atmosphere make the planet so harsh?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!