The oldest rocks of the ocean floor are approximately 200 million years old. These rocks are found in the western Pacific Ocean and are part of the western Pacific seafloor, known as the "Western Pacific Basin." This area contains some of the oldest oceanic crust on Earth.
The age of oceanic rocks is related to the process of plate tectonics, where new oceanic crust is continually formed at mid-ocean ridges through volcanic activity. As the oceanic plates move away from the ridges, they carry with them the older rocks towards the edges of the ocean basins. Over time, these older rocks get pushed back into the Earth's mantle at subduction zones, where tectonic plates converge.
This recycling process limits the age of the oceanic crust, and as a result, the oldest oceanic rocks we find today are generally around 200 million years old. This age is significantly younger compared to the age of the continental rocks, some of which are billions of years old.
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The main difference between protostomes and deuterostomes is the sequence in which the mouth and anus develop during embryonic development. Protostomes develop a mouth first, and deuterostomes form an anus first.
The primary difference between protostomes and deuterostomes lies in the sequence of their embryonic development.
Protostomes, which include organisms like insects and mollusks, follow a developmental sequence where the first opening in the embryo becomes the mouth, and the second becomes the anus.
On the other hand, deuterostomes, including organisms like vertebrates and echinoderms, have a developmental sequence where the first opening becomes the anus, and the second becomes the mouth.
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b. It increases at first, then remains constant.
c.It increases at first, then decreases.
d. It continues to steadily decrease.
b. missense
c. insertion
d. frameshift
Ans. (b). missense.
Sickle cell anemia is an inherited blood disorder, due to defect in oxygen-transporting protein, hemoglobin. It is caused by a mutation in a gene that codes for hemoglobin that substitutes GAG codon (that codes for glutamic acid) with codon GUG (that codes for valine).
It is known as a missense mutation, which leads to formation of a non-functional or defected protein (hemoglobin). The defected hemoglobin gets polymerized and forms fibers that give sickle-shape to the red blood cells.
Thus, the correct answer is option (b).
The type of mutation that causes sickle cell anemia is called missense. That is option B
Mutation is defined as the alteration that occurs in the gene of an organism which leads to defective formation in the organism.
Sickel cell anemia occurs when there is missense mutation at a single point in their DNA.
Therefore, the type of mutation that causes sickle cell anemia is called missense.
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b. Decreases
c. Fluctuates
The answer is A. This is because, in a new environment, mostly of new bare rock can only support plants such as algae and moss (pioneer species). However, as they weather the rocks and soil begin to form, plants such as pteridophytes (ferns) begin to emerge. Eventually, when the soil is deep enough, higher plants such as shrubs and grass emerge and over time trees can grow.
Bro it's identity property of multiplication .