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galina1969 [7]
3 years ago
11

The first animals to live successfully on land were

Biology
1 answer:
Dennis_Churaev [7]3 years ago
8 0
I believe the correct answer will be A
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In which phase of mitosis do the sister chromatids separate at their centromeres?
yuradex [85]
They seperate during anaphase of mitosis
5 0
3 years ago
explain how the two-point discrimination test illustrates how the density of touch receptors in a receptive field varies in diff
inn [45]

Answer:

By experimenting and comparing the results on different body parts.

Explanation:

The "Two Point Discrimination Test" is designed to illustrate the density of touch sensitive receptors for different parts on our body and our ability to tell if there are two distinct objects that we are touching or not.

The density of touch receptors in different receptive fields on our body can be our hands and our back for example, the receptive field density is much more higher in our hands for evolutionary reasons so we are able to more easily tell two distinct objects apart that we are touching with our hands.

I hope this answer helps.

8 0
3 years ago
Soils in ____ contain little organic material and are thin.
irinina [24]
<u><em>Desert.</em></u>
<u><em>hope it helps!</em></u>
5 0
3 years ago
Read 2 more answers
Why is it important that farmers plant crops during the winter that improve the levels of nitrogen in the soil?
brilliants [131]

Answer:

These crops can fix nitrogen into usable nitrates.  

Explanation:

There are certain crops which are called cover crops, specifically legumes like peas, vetch,clover and winter field beans . Farmers grow these crops during winter before the growth of actual target crops like cabbage etc which are thirsty for Nitrogen.

What is special about these cover crops is their ability to fix nitrogen into the soil from the atmosphere. There are various ways through which these leguminous crops can fix nitrogen into the soil:

  • Some legumes  like hairy vetch and crimson clover, may fix upto 100 pounds of nitrogen per acre for the utilization by the crop growing in same soil next season.
  • Other legumes like red clover and bigflower vetch can fix from 30 to 80 pounds of nitrogen per acre .
  • Now how the legumes fix nitrogen is through  a symbiotic relationship with soil-dwelling bacteria. These are the bacteria that dwell in soil and take nitrogen from atmosphere and provide this nitrogen to leguminous crops through roots which later fix this nitrogen into nitrates.In return, the bacteria can get food in the form of carbohydrates  from legumes.

This phenomenon confers the leguminous crops with an ability to fix  nitrogen in the soil that can be used by the nitrogen requiring crops like cabbage when grown next season in same soil.

Hope it help!


5 0
3 years ago
Read 2 more answers
Justin has type A blood and his wife Brittany has type B blood. Justin's parents both have type AB blood, and Brittany's parents
Ad libitum [116K]

Answer:

Option D

Explanation:

Given

Justin has type A blood . Both the parents of Justin has AB blood type

Brittany has type B blood and both the parents of Brittany has AB blood type

This make it clear that -

Genotype of Justin is AA

Genotype of  Brittany is BB

Now if Justin is crossed with Brittany , following blood groups in offspring is possible -

AA * BB

AB, AB, AB, AB

Thus, none of the offspring will have A blood group. Thus the chances that Justin and Brittany's son has type A blood is 0 %

Option D is correct

7 0
3 years ago
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