Answer:
- multiple times
Explanation:
Blastopore is a term used in embryology to refer to an extremity that acts as a means of communication in the embryonic phase, bringing the digestive cavity into contact with the external one. The blastopore forms in the embryonic gastrula period, at which stage cell differentiation begins. Later, another extremity may arise, also during embryonic formation.
Depending on the group to which the animal belongs, this orifice may primarily perform the mouth function - as is the case with protostomies - or initially act as anus of the organism - in the case of deuterostomies.
In either case, we can say that throughout evolution the final detecting of blastoporos has changed several times.
How many times has blastopore fate changed over the course of evolution1 time
Answer:
Although the blood of the fetus and the mother does not mix, Simple diffusion across the membrane of the placenta occurs.And since diffusion is the movement of ions and gaseous molecules across the membrane from the higher concentration of the mother blood to the lower concentration of the fetus, toxic chemical are conveyed across.,
Explanation:
Answer:
Eutrophic.
Explanation:
Eutrophication is defined as the when natural water becomes overly enriched with nitrates and phosphates containing fertilizers, and detergents which induced excessive amount of algae in water. The process of eutrophication may result in water body oxygen depletion.
Example of eutrophication are algal bloom, and great increase of phytoplankton population which increased levels of nutrients in water body.
Atmosphere
Biosphere
Geosphere
The correct answer is A. Asthenosphere.
Explanation
The earth is composed of three large layers: the nucleus, the mantle, and the crust. However, there are more layers within the main layers; in the case of the the asthenosphere, this is a layer of semi-molten materials that is located under the lithosphere (50 to 150km of depth) and has a thickness of around 650km. Additionally, this is located above the mesosphere, another layer of the crust that is part of the mantle, and extends to approximately 2700km deep. Additionally, this layer serves as a transition between the lithosphere and the mesosphere which are two major layers. So, the correct answer is A. Asthenosphere.
Answer:
False
Explanation:
Hope this helps!
Understanding the nutritional content of food is important to maintain a balanced diet, manage weight, and control health conditions like diabetes or high blood pressure.
Understanding the nutritional content of food is crucial for several reasons. Firstly, it helps you to maintain a balanced diet, which is necessary for optimal health. Different foods contain various vitamins, minerals, and other essential nutrients our bodies need to function properly. For instance, fruits and vegetables are high in vitamins and minerals, while meat and dairy products provide protein.
Secondly, knowing the nutritional content aids in weight management. Counting calories, understanding the difference between saturated and unsaturated fats, and being aware of sugar and sodium levels can help you make healthier choices. Lastly, it is indispensable for managing health conditions such as diabetes or high blood pressure, where monitoring certain nutrients is essential.
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Answer:
The food label is designed to help people choose foods well.by knowing how to use it , You can understand how a specific food item can fit into your overall diet.
Answer:
The number of hydrogen bonds involved will be 39
Explanation:
There are 4 types of bases that exist in a DNA, which are adenine, thymine, guanine and cytosine. Double stranded DNA molecules have these bases attaching specifically to one another; adenine only binds to thymine and vice versa while guanine only binds to cytosine and vice versa. These two bases bonding together are referred to as base pairs and the type of bond here is the hydrogen bond. There are double bonds between the adenine and thymine base pair while there are triple bonds between the guanine and cytosine base pairs.
Thus, when there are 13 cytosine bases in a DNA molecule, the number of hydrogen bonds present in the resulting base pairs will be 13 × 3 (because cytosine binds with a triple bond to guanine).
13 × 3 = 39
The number of hydrogen bonds involved will be 39
So, in a DNA molecule of 50 base pairs that contains 15 cytosine (C) bases, there would be a total of 115 hydrogen bonds involved in base pairing.
In DNA, base pairing occurs between complementary nitrogenous bases. Adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). Each base pair is connected by hydrogen bonds.
In a DNA molecule of 50 base pairs with 15 cytosine (C) bases, you can determine the number of hydrogen bonds involved in base pairing as follows:
1. Each adenine (A) pairs with thymine (T) and forms two hydrogen bonds.
2. Each cytosine (C) pairs with guanine (G) and forms three hydrogen bonds.
So, for the 15 cytosine (C) bases, you would have 15 pairs of C-G base pairs, and for the remaining 35 bases, you would have 35 pairs of A-T base pairs.
Total hydrogen bonds involved in base pairing:
(15 pairs of C-G base pairs * 3 hydrogen bonds per pair) + (35 pairs of A-T base pairs * 2 hydrogen bonds per pair)
= (15 * 3) + (35 * 2)
= 45 + 70
= 115 hydrogen bonds.
So, in a DNA molecule of 50 base pairs that contains 15 cytosine (C) bases, there would be a total of 115 hydrogen bonds involved in base pairing.
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