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charle [14.2K]
2 years ago
5

This graph shows that bird ranges in the winter have been shifting northward over several decades

Biology
2 answers:
horsena [70]2 years ago
7 0
The first box is migration
The second box is the northern regions have become warmer because of climate change 
german2 years ago
5 0

Answer:

The first box is migration

The second box is the northern regions have become warmer because of climate change

Explanation:

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Over 90% of all parasympathetic fibers are derived from cranial nerves ________. v (trigeminal) vii (facial) x (vagus) xii (hypo
Natasha2012 [34]
Over 90% of all parasympathetic fibers are derived from the cranial nerve X, which is the vagus nerve. 
The vagus nerve influences most organs below the neck. The activation of this nerve affects heart rate, blood pressure, production of stomach acid, movement of food through the intestines and breathing. 
8 0
1 year ago
The specific heat of a metal is 0.5 cal/ (0C.g). The heat required to raise temperature of 100 gram of that metal by 20 0C is
MAXImum [283]
<span>The specific heat of the metal is 0.5 cal/ (0C.g). This means the energy needed is 0.5 cal to raise the heat of 1 gram of metal by 1 degree C. Therefore, the energy needed to raise 100 g of the metal by 20 degrees C is:
0.5 * 20 * 100 = 1000 cal.


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4 0
1 year ago
Compare and contrast the differences between mature human eggs and sperm in the following questions. For each prompt, determine
Llana [10]

Answer:

QUESTION 1:

a. They undergo unequal cytoplasmic division during meiosis- eggs

b. Their chromosomes have undergone genetic recombination and independent assortment- both gamete types

c. They contain specialized secretory vesicles called cortical granules just under the plasma membrane- eggs

d. They are characterized by a flagellum. Most of these gametes die without ever completing meiosis- sperm

e. The acrosomal reaction occurs in these cells- sperm

f. They can be derived from any adult cell type- neither gametes

QUESTION 2:

c) The egg is surrounded by a mineralized shell added before the egg exits the body.

Explanation:

a) Female reproductive cells undergo meiosis to produce one large egg and three polar bodies. However, an unequal cytoplasmic division occurs in favour of the large egg.

b) Since both egg cell and sperm cell are produced via meiosis and meiotic division involves the processes of genetic recombination and independent assortment, hence, both gamete types have their chromosomes underg genetic recombination and independent assortment.

c) Egg cells contain specialized secretory vesicles called cortical granules just under the plasma membrane. This cortical granules help prevent more sperms from fertilizing the same egg after it has been fertilized.

d) Sperm cells possess flagellum for motility in the female reproductive tract. Most of the sperm cells die without ever completing meiosis.

e) Sperm cells possess an head-covering structure called ACROSOME. Acrosome reaction is the process undergone by sperm cells permeate the zona pellucida of the egg.

f) Gametes are specifically derived from adult reproductive cells and hence, NEITHER TYPE OF GAMETE can be derived from any adult cell type

QUESTION 2:

The egg in Sea urchins is surrounded by a mineralized shell added before the egg exits the body to the external environment. This does not occur in the humans because the egg does not leave the body but fertilized internally.

8 0
2 years ago
As discussed in Investigating Life 15.1, why might bioluminescence be an advantage for some species of dinoflagellates?
marysya [2.9K]

Answer:

Bioluminescence is the phenomenon which is seen in the dinoflagellates which is very common. It is caused due to chemical reactions that takes place inside the organism.

There is an influx of protons in the cell which drops the pH of the cell. It is the oxidation of luciferin which produces the glow.

This phenomenon acts as a shock for the predator because it is in the form of flash for less than 20 microseconds.This flash reduces the number of dinoflagellates which is being eaten by the predator.

4 0
1 year ago
Match these items. 1. asexual reproduction in which the parent cell divides in two pathogen 2. the ability of a virus to cause d
aleksandr82 [10.1K]

2j  

3b  

4a  

5f  

6k  

7e  

8h  

9d  

10c  

11L

8 0
2 years ago
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