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ExtremeBDS [4]
3 years ago
6

Which gas was not present around the time earth first formed?

Biology
2 answers:
Solnce55 [7]3 years ago
4 0

Oxygen was not present around the time earth first formed. Hope this helps. :)

Kisachek [45]3 years ago
3 0
The answer would be A. Methane
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If all living things are related then where did all their differences come from?
stiks02 [169]

Answer:

<em>Hox </em>Gene

Explanation:

First, you're question is very vital, there are many ways in classifying along with identifying all living organisms that includes; morphological analysis, molecular systematics (studying the similarities and differences of the genetic data such in the sequences of DNA, RNA, and rRNA ), homology, cladistics, etc. based on phylogenetic tree, which the study of the evolutionary among various species.

But through it said that all living organisms shared one common ancestor. However, what makes them different from one to another is the homeotic genes that called <em>Hox </em>Genes; which specify the fate of a particular segment or region of the body, meaning the number and arrangements of the<em> Hox</em> genes varies considerably among different types of animals.

For instance, Sponges have at least one homologous to<em> Hox</em> genes, also insects have nine or more <em>Hox </em>genes resulting in multiple <em>Hox </em>genes occur in a cluster in which the genes are close to each other along a chromosome. Therefore, increases in the number of<em> Hox</em> genes have been instrumental in the evolution of many animals species with greater complexity in body structure.

Overall, more <em>Hox</em> genes, more complexity in body structure resulting in the differences of their morphological structure.

Hope that answered your question!

7 0
3 years ago
When NAD+ becomes NADH, it is being
ipn [44]

NAD+ accepts a hydrogen ion (H+) and two electrons (2e−), as it becomes reduced to NADH + H+. The NADH moves to the electron transport chain and donates a pair of electrons (becomes oxidized) to the first compound in the chain.

Explanation:

5 0
3 years ago
What type of adaptation is tobogganing? <br> a. structural<br> b. behavioral<br> c. functional
sergey [27]

Answer:

C

Explanation:

A toboggan is a simple sled traditionally used by children. It is well adapted to sliding down open slopes, where its large surface rides easily on loose, fluffy snow.

3 0
2 years ago
When the genetic material found within an offspring is diverse, what type of reproduction is responsible?
AnnZ [28]

Answer:

sexual reproduction, because the genetic material comes from both parents.

Explanation:

The sperm and egg produced contain different combination of genes

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3 years ago
I keep filling it in but keep loosing points ! I need help !
Alexxandr [17]
Ik this in spanish but i dont know how can i translate this

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3 years ago
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