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
Mandarinka [93]
3 years ago
7

The major difference between angiosperms and gymnosperms comes from the _____.

Biology
1 answer:
kumpel [21]3 years ago
4 0

Answer:

presence or absence of a protective covering over the ovule

Explanation:

In angiosperms, seeds develop from ovules and are enclosed in the ovary. So, their is the presence of protective covering making the seeds enclosed.

On the other hand, gymnosperms have seeds that are borne on cones, so they are naked due to the absence of any protective covering over the ovule.

You might be interested in
Briefly describe how amniocentesis and chorionic villi sampling are used in genetic screening.
bearhunter [10]

Answer:

Amniocentesis is an invasive method that involves the aspiration of 10-20 ml of fetal water through the abdominal wall under ultrasound-guided control. In most cases, the procedure is performed around the 16th week of gestation. The fetal water sample contains fetal cells, mostly cells of fetal skin and the epithelium of the urinary tract.

Chorionic Villus Sampling (CVS) biopsy is performed between weeks 11 and 12 of gestation. During biopsy, with ultrasound guidance, the tissue of the chorionic fossa is aspirated mainly across the abdomen (transabdominal pathway). The biopsy specimen is of fetal origin and belongs to the outer layer of blastocyst cells or the trophoblast (outer layer of the placenta). Very often, the biopsy specimen contains tissue of the decidua (mucous membrane of the uterus) that is of maternal origin, and it is necessary to remove the maternal tissue before any treatment of the sample.

Explanation:

The amniocentesis procedure carries a risk of miscarriage of 0.5-1%.  After aspiration of the fruit of the water, the sample is centrifuged to separate the cells from the amniotic fluid. Separate cells are seeded on a nutrient medium (cell culture) that stimulates cell growth. After about 14 days, the cell culture is further used for various genetic or biochemical analyzes such as karyotyping.

The advantage of chorionic biopsy is the amount of biological material, which is sufficient for the whole a number of different laboratory procedures. Also, a great advantage is the timing of the procedure as it allows diagnosis in the first trimester of pregnancy, but the chorionic biopsy procedure itself carries a risk of miscarriage of 1-2%.

3 0
3 years ago
The suprachiasmatic nuclei enable the nervous system to respond to daily light/dark alterations through their stimulation of
timama [110]

Answer:

The suprachiasmatic nuclei enable the nervous system to respond to daily light/dark alterations through their stimulation of melatonin.

Explanation:

Melatonin is a hormone produced naturally by the body. Its function is to regulate the body's circadian cycle. This hormone is stimulated and begins to act by changing between a light environment and a dark environment. This stimulation interacts with the suprachiasmatic nuclei making the nervous system understand this change and luminosity of the environment and respond to the action of melatonin.

8 0
3 years ago
What are examples of heritable genes?
Lera25 [3.4K]

Hair color, eye color, height, and even some disorders such as schizophrenia

6 0
3 years ago
EVOLUTION QUESTION FOR PAST APES/AP BIO STUDENTS!!!
valentinak56 [21]

Answer:

Humans

Explanation:

Prosimians include the bush babies of Africa, the lemurs of Madagascar, and the lorises, pottos, and tarsiers of Southeast Asia. I belive that those are closer to humans than birds.

3 0
2 years ago
PASAR DE ESCALA celsius a kelvin
SVEN [57.7K]
Multiplica celcius por 274.15 para saber cuanto es en kelvin.
7 0
3 years ago
Other questions:
  • How many parents are required for asexual reproduction none one two or three
    9·1 answer
  • During assessment, a patient states, "i don't know why god is punishing me like this." which nursing diagnosis would the nurse m
    15·1 answer
  • If oxygen moves from an area of high concentration outside of the cell to low concentration inside the cell, which method of mov
    13·2 answers
  • Which of the following is a TRUE statement regarding the skeletal system? There are 28 vertebrae that cover the spinal cord. The
    6·1 answer
  • BIOLOGY HOMEWORK
    6·1 answer
  • Which of the planets fits the following description: "a solid, cool surface, with occasional dust clouds and a thin CO2 atmosphe
    13·1 answer
  • Can someone help me??
    8·1 answer
  • Please help me here the picture
    5·1 answer
  • que cantidad de calor se debe aplicar a una barra de plata de 24kg para que eleve su temperatura de 20°C a 80°C​
    10·1 answer
  • Using the phylogenetic tree which is more related fungi and animals or plants and fungi. Explain why​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!