BIOLOGY HIGH SCHOOL

Could you tell me what Are Spores?

Answers

Answer 1
Answer: Basically just a unit of ASEXUAL REPRODUCTION 

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The Kenyanthropus platyops find at Lake Turkana, Kenya, although still debated, could mean that __________. a) Early humans had a diverse diet b) Early humans had a limited diet c) Early humans lived in caves d) Early humans were primarily herbivores

Answers

The Kenyanthropus platyops find at Lake Turkana, Kenya, although still debated, could mean that:

a) Early humans had a diverse diet

The discovery of Kenyanthropus platyops suggests the possibility of a more diverse diet among early humans. However, it's important to note that the interpretation of this find is still a subject of debate in the field of paleoanthropology.

When environmental conditions are unfavorable, why is it an advantage for green algae to reproduce sexually? a. They are multicellular when conditions are unfavorable, which favors sexual reproduction.
b. Sexual reproduction produces larger numbers of offspring in less time.
c. Sexual reproduction produces offspring that have greater genetic variety and durable zygotes that can help green algae species survive unfavorable conditions.
d. Sexual reproduction produces multicellular algae instead of unicellular algae. Multicellular algae are better able to survive harsh conditions.

Answers

d. Sexual reproduction produces offspring that have a greater genetic variety and durable zygotes that can help green algae species survive unfavourable conditions.

The mismatch of a DNA base pair during duplication can result in a mutation.True
False

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The answer is true. Mutation is the result of the mismatch of a base pair during the duplication. Mutations are neither the results from errors during the replication of DNA or other types of damage to DNA. In simpler words, DNA errs to copy accurately.
The statemnt is true. Mismach is base pairs is one of the common types of mutations, that occur. This may be due to substitution caused by purine by purine, and pyrimidine by pyrimidine. The other type is transversion, in which, purne is replaced by pyrimidine, and pyrimidine by purine.

Breathing in humans is driven by all of the following except A. the muscles attached to the ribs. B. the diaphragm. C. air pressure. D. the muscles connected to the lungs.

Answers

Air pressure, all of the others are found within the body and contribute to both the lungs and the heart. 

Which statement(s) is/are indicative of a covalent bond?1) Electron movement is concentrated somewhere between the two bonded nuclei.

II) Electron density is focused on one element in the bond, generally resulting in the formation of a crystalline substance.

III) The greatest probability of finding the shared electrons is in the area of orbital overlap.

IV) The valence electrons involved in the bond are moving solely around the nucleus of the atom with the higher electron affinity.

es )

I and II

ll and I

I and III

I, III and IV

An substance for a crystalline is NaCl

Answers

Answer:

The statements which are indicative of a covalent bond are as follows -:

  • Electron movement is concentrated somewhere between the two bonded nuclei.
  • The greatest probability of finding the shared electrons is in the area of orbital overlap.
  • The valence electrons involved in the bond are moving solely around the nucleus of the atom with the higher electron affinity.

Explanation:

Among the given four statements, three statements are correct, the statement- "Electron density is focused on one element in the bond, generally resulting in the formation of a crystalline substance." is incorrect as In ionic bonds, crystalline formation takes place.

  • Somewhere between the two bonded nuclei, electron movement is centered. --: Covalent bonds are a class of chemical bonds in which valence electrons are shared between two atoms, typically two non-metals. The formation of a covalent bond helps the non-metals to obey the octet 's law and thus become more stable.
  • The greatest probability of finding the shared electrons is in the area of orbital overlap.-: A pi bond (π bond) is a type of covalent bond arising from the overlap of two p orbitals side by side.
  • The valence electrons involved in the bond are moving solely around the nucleus of the atom with the higher electron affinity.- : As pairs of electrons are exchanged by atoms, covalent bonding happens. In order to achieve further stability, which is gained by forming a complete electron shell, atoms can covalently bond with other atoms. Atoms can fill their outer electron shell and achieve stability by exchanging their outermost (valence) electrons.
  • Hence , the correct option is D (I,II and IV )

Final answer:

For a covalent bond, statements I) and III) are correct: the electron movement is focused between the bonded nuclei, and the greatest probability of finding shared electrons is in the area of orbital overlap.

Explanation:

In a covalent bond, the electrons move between the two atoms rather than being focused on one atom, which means statement I) is correct. Statement II) is typically characteristic of an ionic bond, not a covalent bond. Statement III) is also correct since the greatest probability of finding the shared electrons in a covalent bond is in the area of the orbital overlap. Statement IV) is incorrect because the electrons are not moving solely around one nucleus but are shared between the atoms.

Therefore, the covalent bonding characteristics are reflected in statements I and III, which indicates that electron movement is concentrated somewhere between the two bonded nuclei, and that the greatest probability of finding the shared electrons is in the area of orbital overlap.

Learn more about Covalent Bond here:

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3 different ways in which carbon is added to the atmosphere by natural means

Answers

(The 3 examples are:)

~ CO2 from burning fossil fuels

 ~ gas (methane) leaks from underground gas pipes

~ methane from rotting material in landfills

(Other ones)
~ combustion of fossil fuels (oil, coal, and gas)

~ deforestation (decreasing amount of plants that remove CO2 from the atmosphere)

~ industrial production that uses petroleum based products (mineral/metal production)
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