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eduard
3 years ago
5

How is it possible a lead of an extinct fern is found in Antarctica?

Biology
1 answer:
PSYCHO15rus [73]3 years ago
4 0

Answer:

due to the continental drift

Explanation:

The theory of continental drift states that Earth's continents moved over time (i.e., they have drifted across the Earth's surface over time). The theory of continental drift was proposed by Wegener in the early 20th century. This theory has been incorporated into the idea of plate tectonics, a theory that describes the movement of seven large plates on Earth's lithosphere three billion years ago. The discovery of an extinct Permian order of seed ferns (i.e., Glossopteridales) in the Antarctic continent is nowadays considered as a proof that continents were once joined and moved over time.

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If the nucleotide sequence on one side of a DNA molecule is CCTAGCT, then the sequence on the complementary strand of DNA will b
valentinak56 [21]

Answer:GGATCGA

Explanation:

The complementary double helix of the DNA are antipararell to each other.

Chargaff's rule state that Adenine always pairs with thymine (double bond) and Cytosine always pairs with guanine (triple bond).

Therefore if a DNA molecule is CCTAGCT, then the sequence on the complementary strand of DNA will be GGATCGA as written below

5' CCTAGCT 3'

3' GGATCGA 5'

5 0
3 years ago
PLS HELP!!<br> SEE ATTACHMENT!!
Furkat [3]

Answer:

B

Explanation:

If there is too much stuff in the cell, it is going to explode. Especially when more stuff is flowing into it.

6 0
3 years ago
Read 2 more answers
Select the correct statement about the evolution of animals.
WARRIOR [948]

Answer:

The correct answer is b. The oldest generally accepted fossils of large animals range in age from 565 to 550 million years old.

Explanation:

The oldest one of them all is the hematite tubes, that are dated about 3.77 billion to 4.2 billion years and it's from a yet unknown bacteria.

5 0
3 years ago
A tall plant crossed with a short one produced offspring, of which about half are tall and half are short. What are the genotype
stellarik [79]

Answer:

Rr x rr

Explanation:

Let's say

RR is a tall plant.

Rr is tall

& rr is a small plant

The only genotypes you can get to make two tall and two short is if you use a  hetero pair and a same ressesive (rr) genes.

4 0
3 years ago
List two reasons that enzymes are needed... why don't active<br> sitesexist on their own?
Yakvenalex [24]

Answer:

Enzymes are proteins in composition which are a very essential component of the metabolic reactions in the living organisms.

The properties of enzymes allow the enzymes to be used as a reaction catalyst which increases the speed of the reaction.

The enzymes lower the threshold energy of the chemical reaction and thus increases the rate of reaction.

The enzyme catalyses very complex reactions like a breakdown of complex biomolecules as well as the formation of complex biomolecules.

The active sites are present on the enzymes which bind the substrate molecule and increases the pace of reaction.

5 0
3 years ago
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