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3 years ago

How are convection currents and plate tectonics related?

Biology

1 answer:

tangare [24]3 years ago

7 0

Answer:

Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents. These currents cause the movement of the tectonic plates that make up the earth's crust.

Explanation:

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Which characteristic is the most primitive and least evolved trait, with regard to plants? A) lack of vascular tissue B) seeds e

LenKa [72]

<span>C) use of spores instead of seeds</span>

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3 years ago

After fertilization a zygote forms. The cells then go through mitosis. Explain how this bundle of cells eventually forms a human

yaroslaw [1]

Answer:

Human fertilization and development

Fertilization is the process in which haploid gametes fuse to form a diploid cell called a zygote. To ensure that each zygote has the correct number of chromosomes, only one sperm can fuse with one egg.

Stages of human development

Zygotic stage: The zygote is formed when the male gamete (sperm) and female gamete (egg) fuse.

Blastocyst stage: The single-celled zygote begins to divide into a solid ball of cells. Then, it becomes a hollow ball of cells called a blastocyst, attaching to the lining of the mother's uterus.

Embryonic stage: The major internal organs and external features begin to emerge, forming an embryo. In this stage, the heart, brain, and spinal cord become visible. Arms and legs start to develop.

Fetal stage: Once the formed features of the embryo begin to grow and develop, the organism is considered a fetus. Differentiation and specialization of structures happens during this time.

Development overview showing the progression from zygote to blastocyst to embryo to fetus.

Differentiation and apoptosis

During development, the number of cells must increase through division so that body axes, tissues, organs, and structures must form. Individual cells become specialized in their structure and function through the process of cell differentiation.

Unnecessary cells also must be removed in order to help form important structures. This occurs is through the process of apoptosis. For example, human hands start out as a paddle-like block of tissue. Eventually, the block was “carved” into fingers by apoptosis of the cells in between the developing fingers.

Microscope images from a scientific paper, showing a developing mouse paw. The cells between the developing digits are stained by a marker that indicates apoptotic cells.

Explanation:

8 0

3 years ago

Plz help me it a timed test

qwelly [4]

<h2>Hey There!</h2><h2>_____________________________________</h2><h2>Answer:</h2>

$\huge\boxed{\text{Equal and Opposite Force on the Person}}$

<h2>_____________________________________</h2><h2> $\Huge\textbf{3rd Law of Motion}$ </h2>

$\large\texttt{"To Every action there is always an equal and opposite reaction"}$

Consider two bodies A & B which collide with each other. If $F_{AB}$ be the force exerted by the body A on Body B. Then Body B will also exert force $F_{BA}$ on Body A which is equal in magnitude but opposite in direction.

$F_{AB} = - F_{BA}$

The force exerted by Body A on Body B is called Action, and the force exerted by the Body B on Body A is called Reaction.

<h2>_____________________________________</h2><h2>Best Regards,</h2><h2>'Borz'</h2>

6 0

3 years ago

Yolk molecules tend to accumulate in the vegetal half in the fertilized eggs of most animals, and the presence of yolk can slow

bazaltina [42]

cells in the vegetal half of the embryo should be unpigmented those in the animal half and there should be heavily pigmented.

Explanation:

The Yolk molecules moving in the vegetal halves of the egg which is the case in most of the animals, slows down the cell division. These lesser division area or the zone demarcates the area to be vegetal pole and due to lesser cell division, it becomes unpigmented or less pigmented Based on the observation time and perspect with assuming no movement.

The pole opposite to the vegetal, is animal pole which with absence or less of yolk, gets more ability to divide and hence become more pigmented or heavily pigmented. This brings polarity to the egg and becomes telolecithal egg.

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4 years ago

WILL GIVE BRAINLIEST, AND 10 POINTS! YOU MUST KNOW FOR SURE THOU!

olchik [2.2K]

Vestigial structures are parts of an animal's body that serve no function, but did in earlier evolutionary stages. Two examples of this are the human appendix and the snake pelvic bone.

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3 years ago

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