BIOLOGY HIGH SCHOOL

Select all that apply.During gastrulation, cnidarians develop which tissue layers?

A.) ectoderm
B.) endoderm
C.) mesoderm

Answers

Answer 1
Answer: The answers are A) ectoderm and B) endoderm.

Fertilization is a fusion of male and female gametes which leads to the formation of a zygote. The zygote undergoes mitosis and transforms into a single-layered blastula. Gastrulation is a transformation of the blastula into a two-layer or three-layer gastrula. Cnidarians are a diploblastic animal because their gastrula has only two layers - endoderm and ectoderm.
Answer 2
Answer:

the answer is A and B

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Which fungi group is known as the zygote fungi and produces spores in zygosporangia?
What determines the traits of offspring
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Which of the following is not a physiological characteristic of wheat1?A. It may be photoperiod sensitive (long days required for flowering).B. Some cultivars have a vernalization requirement.C. It is a C4 plant.D. Plasticity of yield components enable it to adapt to changing environmental conditions.

What is the difference between the beliefs of the Nation of Islam different from the beliefs of the Southern Christian Leadership Conference? A. The Nation of Islam desired a sense of community with whites.
B. The Nation of Islam desired more interaction with whites.
C. The Nation of Islam used nonviolent means to achieve equality.
D. The Nation of Islam used any means necessary to achieve equality.

Answers

the difference between the beliefs of the Nation of Islam different from the beliefs of the Southern Christian leadership conference is : D. The nation of islam used any means necessary to achieve equality

Malcolm X was really famous for his quotes : "there's no such thing as non violent revolution"

Hope this helps

Describe an early monotreme mammal.

Answers

Monotremes are egg-laying mammals. The young are not born, but hatched.

Virus? Living or not? If we use the image as an indicator, we might say living because

Answers

A virus is a tiny organism and may lead to mild-severe illnesses in animals or plants or humans.

Biologically we can term virus as a bit of RNA or DNA in a protein coat. It cannot replicate without another organism.

If we use an image of indicator, we may say yes virus is living. This is because the virus particle is non-cellular but has an NDA core.This core is enclosed in a protein coat and it has spike-like projections in all over its surface.

Answer:

b

Explanation:

Question 1 All living organisms contain carbon atoms. Which of the following is an important characteristic of carbon?

Question 1 options:

Carbon atoms are highly reactive and form unstable bonds with any available atom.


Carbon atoms can bond with any other atom, but they cannot form bonds with other carbon atoms


Carbon atoms are very stable and do not easily form bonds with other atoms


Carbon atoms can bond with many other kinds of atoms to form very stable molecules.



Question 2
Any chemical that contains carbon bonded to at least one other atom, usually hydrogen, is known as a

Question 2 options:

Carbohydrate


Fatty Acid


Organic Molecule




Question 3
How many valence electrons are generally needed to fill the outer shell of most atoms?

Question 3 options:

4


6


8



Question 4
The macromolecules in biochemistry are proteins, carbohydrates, lipids and nucleic acids. What main elements do all of have in common?

Question 4 options:

Carbon and Sulfur


Carbon and Hydrogen


Oxygen and Nitrogen


Oxygen and Phosphorus

Answers

1. The correct answer is 4. Carbon can bond to 4 other atoms, exponentially increasing its ability to make different molecules.

2. The correct answer is 3. An organic compound (or molecule) is any atom (usually hydrogen) that bonds with carbon.

3.  The correct answer is the third option (8 electrons). Valence electrons in the outer shell are those can form a chemical bond. When (most) atoms have 8 electrons in their outer shell, they are then considered to have maximum stability.

4. The correct answer is 2. These macromolecules all contain carbon and hydrogen, making them organic compounds. 
1 - Carbon atoms can bond with many other kinds of atoms to form very stable molecules. 2 - organic molecules . 3 -  8 (full shell) . 4 - i'd say Carbon and Hydrogen

Rising levels of carbon dioxide most likely

Answers

Answer:

The elevating levels of carbon dioxide most probably can diminish the productivity on the land and the sea. In case, when there is an elevating level of carbon dioxide in the atmosphere, more amount of carbon dioxide gets dissolved within the water bodies like sea. This further enhances the levels of pH, which leads to coral bleaching and other deleterious things that can hamper biodiversity found in the water ecosystem.  

Even on land, the phenomenon of global warming resulting due to an increase in the levels of greenhouse gases leads to change in climate. Due to change in climate, a decline can be witnessed in the diversity of crops, and thus also diminishes productivity, which hampers farmers that depends on productivity as the source of income.  
Since the Inbdustrial Revolution, human sources of CO2 emissions have been growing.
Activities such as buring fossil fuels, and deforrestation are the primary cause of the increased CO2 concentrations in the atmosphere.

Paneth cells ________.A. are more common in the ileum than in the jejunum
B. are absorptive cells in the small intestine
C. secrete enzymes that kill bacteria
D. are located next to the lacteal in a villus

Answers

C) secrete enzymes that kill bacteria
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