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
vovangra [49]
3 years ago
11

Please solve all of question 20

Biology
1 answer:
Musya8 [376]3 years ago
6 0

Answer:

use ur textbook

Explanation:

it says use it

You might be interested in
Your brain and neurons are in constant action, sending billions of ___________and________messages each day to keep everything, f
Leviafan [203]

Answer:

Until recently, most neuroscientists thought we were born with all the neurons we were ever going to have. As children we might produce some new neurons to help build the pathways - called neural circuits - that act as information highways between different areas of the brain. But scientists believed that once a neural circuit was in place, adding any new neurons would disrupt the flow of information and disable the brain’s communication system.

In 1962, scientist Joseph Altman challenged this belief when he saw evidence of neurogenesis (the birth of neurons) in a region of the adult rat brain called the hippocampus. He later reported that newborn neurons migrated from their birthplace in the hippocampus to other parts of the brain. In 1979, another scientist, Michael Kaplan, confirmed Altman’s findings in the rat brain, and in 1983 he found neural precursor cells in the forebrain of an adult monkey.

These discoveries about neurogenesis in the adult brain were surprising to other researchers who didn’t think they could be true in humans. But in the early 1980s, a scientist trying to understand how birds learn to sing suggested that neuroscientists look again at neurogenesis in the adult brain and begin to see how it might make sense. In a series of experiments, Fernando Nottebohm and his research team showed that the numbers of neurons in the forebrains of male canaries dramatically increased during the mating season. This was the same time in which the birds had to learn new songs to attract females.

Why did these bird brains add neurons at such a critical time in learning? Nottebohm believed it was because fresh neurons helped store new song patterns within the neural circuits of the forebrain, the area of the brain that controls complex behaviors. These new neurons made learning possible. If birds made new neurons to help them remember and learn, Nottebohm thought the brains of mammals might too.

Other scientists believed these findings could not apply to mammals, but Elizabeth Gould later found evidence of newborn neurons in a distinct area of the brain in monkeys, and Fred Gage and Peter Eriksson showed that the adult human brain produced new neurons in a similar area.

For some neuroscientists, neurogenesis in the adult brain is still an unproven theory. But others think the evidence offers intriguing possibilities about the role of adult-generated neurons in learning and memory.

if wrong report me

5 0
3 years ago
PLS HELP!! ASAP DUE TONIGHT!!
guapka [62]

Answer:

D. a higher number of double bonds between carbon atoms in their structures.

Explanation:

7 0
2 years ago
An old alternative hypothesis for the evolution of infanticide was that parents killed offspring (including their own) when food
Alika [10]

Answer:

On the basis of gender preference.

Explanation:

In the modern view of adaptation, the main cause of infanticide is not the food  but the gender preference. In many societies, people killed their infant when they knew that the infant is a girl. They thought that having a girl is curse or shameful thing so they kill the infant. These type of people wants male baby or prefer male child so that's why they kill the infants. In the ancient times, infants were killed that were abnormal or having any defects but today it happen due to gender preference.

6 0
3 years ago
Which organism is most specialized
gregori [183]

Answer:

The answer is a human.

Humans are multicellular eukaryotic organisms

4 0
3 years ago
Read 2 more answers
Select the correct answer. An object is acted upon by a force of 22 newtons to the right and a force of 13 newtons to the left.
lana [24]

Answer:The net force is the sum of all the forces acted upon an object. The direction of force depends on which side you are taking as a positive and negative force. If the force of 22 newtons is positive and the force of 13 newtons is negative, they are actng on the object on different directions, thus in order to get the net force, we just sum them up.

newtons

The net force is +9 Newtons.

Explanation

:

7 0
2 years ago
Other questions:
  • Which is avascular (lacks blood vessels)? epithelial tissue muscle tissue nervous tissue connective tissue all of the choices ar
    5·1 answer
  • I need help please with this...
    10·1 answer
  • Is anaerobic metabolism only common in elite athletes?
    14·1 answer
  • How do small molecules move through the membrane?
    5·2 answers
  • Cell respiration begins with
    8·1 answer
  • Why is a lumbar puncture performed between the L4 and L5 vertebrae
    14·1 answer
  • cells have different external structures, such as cilia, pseudopods, and flagella. What function do these structures share? What
    6·1 answer
  • A client with dementia and a percutaneous endoscopic gastrostomy (PEG) tube is being cared for at home. Which action provides ev
    10·1 answer
  • Please help!<br>I need to complete this fast​
    7·1 answer
  • Which of the following traits are derived in primates, not ancestral? Mark all that apply.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!