B. 245 million
from the end of Carboniferous Period to the beginning of the Triassic period
Answer:
E) In both mosses and ferns, moisture is required for sperm to reach the egg. In mosses, gametophyte is the dominant stage of the life cycle. In ferns, the sporophyte is the dominant stage of the life cycle.
Explanation:
The *sporophyte of fern plant is dominant over the smaller and nutritionally independent gametophyte*. The sporophytes are photosynthetic, long-lived and highly branched. *Sperm cells of fern possess whip-like flagella in their cell walls that enable moisture swim to reach the egg*
*In Mosses,the gametophyte is more prominent (dominant)* just like in lower plants. These organisms *require external water(moisture) in the form of dew or rain to move their sperm during fertilization*.
Therefore, *In ferns, the sporophyte is dominant over the gametophyte*, while *in mosses,gamatophyte is dominant over the sporophyte.* Both require moisture for sperm to reach egg.
In eukaryotic cells, the DNA that codes for the cell's proteins is stored in a membrane-bounded organelle called the nucleus.
<h3>What is the nucleus?</h3>
The cell nucleus is an organelle delimited by a membrane where the cellular genetic material organized in DNA molecules together with proteins such as histones is stored. Its function is to keep this genetic material protected and control the expression of DNA, as in the transcription of proteins.
Therefore, we can confirm that In eukaryotic cells, the DNA that codes for the cell's proteins is stored in a membrane-bounded organelle called the nucleus.
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The tRNA molecule determines the type of amino acid!
A solid minute object that is said to come together for the formation of the planet and are believed to produce cosmic dust are called planetesimal.
The options that best describes the planetesimals are:
- Option A. They are the origins of planets.
- Option B. They formed from gas and dust.
- Option D. They are believed to have developed in debris disks.
The descriptions can be explained as:
- It is believed that planets formation occurred through planetesimals. The formation happened from gas, dust particles and debris.
- By the process of accretion, the discs coalesced and became bigger and solid over time. This bigger mass started attracting other matters towards each other because of gravitational force.
- This pull resulted in either breaking or creation a bigger mass of pieces known as planetesimals. The collision continued to become bigger and solid planets we know today.
Therefore, options A, B and D are correct.
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