Answer:
13
Explanation:
The atomic number for Aluminum (Al) is 13. If you have access to the periodic table, this would've taken a few seconds.
Two factors contributed to the success of the pteridophytes: the extreme miniaturization of the gametophytic generation and an important development of the sporophytic generation (development of the tree forms).
Pteridophytes are a group of plants that peaked in the Carboniferous (-300 million years). It is the first great terrestrial plant civilization. These plants would have appeared in the Devonian -400 million years ago, perhaps from certain primitive terrestrial plants which, unlike bryophytes, would have favored the diploid generation on the haploid generation.
Particularly well adapted to terrestrial life, they have created, thanks to the development of tree forms, immense forests whose fossilization is at the origin of coal deposits.
Pteridophytes are at the origin of an evolutionary lineage based on the extreme miniaturization of gametophytic generation and an important development of sporophytic generation, leading to all tracheophytes including current flowering plants. Pteridophytes are well adapted to terrestrial life, however fertilization still requires the presence of water since male gametes are swimmers.
When a bend in a river gets cut off...
Answer:
A
Explanation:
its the only that is true.
<h3><u>Answer;</u></h3>
Having untested DNA samples
<h3><u>Explanation;</u></h3>
- <em><u>DNA technology has a great and a wide variety of important uses, which ranges from,paternity testing, to matching the DNA samples of suspects collected at a crime scene, to matching relatives to a missing person's DNA.</u></em>
- However, <em><u>use of DNA in forensics may have negative consequences which includes, the backlogs of forensic evidence and also present of untested DNA samples which delays the whole process.</u></em>
- <em><u>Having untested DNA samples refers to presence of evidence collected from the crime scenes that is untested and instead it is stored in the law enforcement evidence rooms and has not been submitted to crime laboratory to be analyzed. </u></em>
