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
Andrews [41]
4 years ago
8

"Chordates possess several distinguishing characteristics that separate them from other animal groups. Which of these features i

s not found in ALL chordates?" a. Postanal tailb. Pharyngeal slits c. Vertebral column d. Notochord e. Dorsal hollow nerve cord
Biology
2 answers:
matrenka [14]4 years ago
6 0

Answer:

Vertebral column.

Explanation:

The main division of the animal phylum includes chordates and non -chordates. Most of the chordates have bilateral symmetry, triploblastic animals with the digestive system, circulatory system and excretory system.

Chordates have some specific features that distinguishes them from the non chordates. Chordates posses notochord, dorsal hollow nerve cord, post ana.l tail and pharyngeal gill slits at the specific or the some stages of their life. The vertebral column is present only in vertebrates and not present in other chordates.

Thus, the correct answer is option (c).

ladessa [460]4 years ago
5 0

Answer:

Chordates possess several distinguishing characteristics that separate them from other animal groups. Which of these features is not found in ALL chordates?

Vertebral column

Explanation:

You might be interested in
The miller-urey experiment was important because it showed __________.
lapo4ka [179]
The Miller-Urey experiment is important because this was considered as the breakthrough in the study of origin of life, as to where and how exactly life began on earth and that it was possible to form organic molecules from inorganic molecules. 
8 0
3 years ago
Evaluate whether a sea beeze could occur night
Natalija [7]

Answer:

During the night the water releases it's heat much slower causing the air over the water to be warmer than the air over the land. This ends up working the same as the sea breeze only this time the lower pressure is over the sea and the air then moves from the land.

5 0
2 years ago
Read 2 more answers
How is it possible for one twin to get skin cancer but the other one doesn´t
tia_tia [17]

Looking at most newborn twins squirm contentedly in their cribs, you'd never guess that some were recently in peril. That's because carrying multiples raises the risks that a woman can suffer complications before she actually delivers.

Many twins are miscarried early in the pregnancy, often before a woman even knows she's pregnant. As reported in the International Journal of Fertility, only about one in eight embryos that starts as a twin is born as a twin. If they do survive, twins are usually born healthy. However, they are still more likely than other babies to have birth defects or to be born prematurely or underweight.

Carrying twins can be hard on you, too. You'll be more likely to develop pregnancy-related high blood pressure or diabetes. And there's a greater likelihood you will have a cesarean section when you deliver.

If you're carrying twins, some simple lifestyle changes and good prenatal care may help you reduce the likelihood of the following complications.

Low birth weight

Because they have to share nutrients and living space, newborn twins tend to be smaller than single babies. Even full-term twins often weigh less than 5-1/2 pounds each, making them vulnerable to a variety of health problems. You can help your babies reach a healthy size by making sure you put on enough weight during pregnancy. Try to eat 300 calories more each day than you would if you had a single baby (about 2,700 calories in total). If you had a healthy weight before pregnancy, you should aim to put on about 35 or 45 pounds.

Unequal size

Twins don't always share equally. In roughly 30 percent all twin births, one baby will be larger than the other. Some studies suggest that if one of your babies is at least 25 percent heavier than the other, one or both of them may be more likely to have breathing problems or need intensive care. Your doctor will track the growth of both your babies throughout your pregnancy. The first signs of unequal growth usually appear in the third trimester.

Twin transfusion syndrome

Twin transfusion syndrome poses a dangerous threat to identical twins who share a single placenta. It's normal for such twins to exchange blood during a pregnancy. But in about 20 percent of cases, one twin starts pumping large amounts of blood to the other twin, putting both of them at risk. In severe cases, the twin receiving the extra blood may develop heart failure while the other twin becomes dangerously anemic. Early diagnosis and treatment can slow the abnormal blood flow and lower the risk of complications.

Birth defects

Birth defects are common in twins, especially identical twins. Taking folic acid before and during pregnancy can help prevent neural tube defects. As reported in the medical journal The Lancet, however, about 10 percent of all identical twins are born with a birth defect such as a heart problem, a shortened limb, a club foot, or a dislocated hip (the conditions listed are linked to having less space in the uterus and would not be affected by folic acid.) Most of these conditions are treatable, however.

Risks to the mother

Your doctor will check you regularly throughout the pregnancy for signs of high blood pressure or diabetes. When detected early, both of these conditions can be controlled before they have a chance to threaten your pregnancy.

Special care

Carrying twins means you'll probably get extra attention from your doctor throughout your pregnancy. The doctor may suggest cutting back on activities between the 20th and 30th week of pregnancy, even if you haven't had any signs of labor. Many physicians also recommend an extra monitoring check on the babies' heart rate and movement, such as an ultrasound or nonstress test. A biophysical profile, which checks on heart rate, movement, and the amount of amniotic fluid in your body, might also be indicated. If you do go into labor prematurely, your doctor may suggest drugs to stop the labor or use corticosteroids to speed up the development of the babies' lungs.

It's possible that you may be able to deliver twins vaginally. But if the labor is difficult, the birth canal is too narrow, or one or both of the infants is in the breech position, you may have to undergo a c-section, in which the babies are delivered through an incision in your uterus. Talk to your doctor about what you can do to prepare for delivery.

Twins are a special challenge, both before birth and after. For now, your job is to stay healthy and get top-quality prenatal care. Two important people are counting on you.

Does this help lol :D

4 0
3 years ago
Read 2 more answers
The thylakoids of chloroplasts are the location of several important steps of photosynthesis. Suppose you put chloroplasts in th
Savatey [412]
The answer is A I think
7 0
2 years ago
What happened to the red blood cells after the sugar was added to the solution
Travka [436]

Answer:

Studies revealed that glucose binds with the RBC membrane and intracellular proteins and increases membrane rigidity. The thing is that the concentration of glucose in the solution used is less than compared to the concentration of the same inside RBC and the cells swell up due to endometriosis.

4 0
3 years ago
Other questions:
  • Sort the chemical reactions based on whether they absorb or release energy.
    13·2 answers
  • Carbohydrates contain a. carbon, nitrogen, and phosphorus. b. carbon, sulfur, and potassium. c. carbon, hydrogen, and oxygen. d.
    11·1 answer
  • How are the reactants and products of photosynthesis and respiration related to one another?
    10·1 answer
  • Explain wich part of dna carries the info and makes every organism unique
    7·1 answer
  • In what way is eukaryotic transcription more complex than prokaryotic transcription?
    15·1 answer
  • Differences among blood groups result from: chemical differences on the red blood cell chemical differences in body cells other
    7·1 answer
  • The common cold, caused by a rhinovirus, affects the average adult ___ times per year.
    5·2 answers
  • Who is the man known to be responsible for the five basic rules of genetics?
    6·1 answer
  • What is the main substrate in the first step of glycolysis?
    14·1 answer
  • 50 POINTS!!!!!
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!