One of the events that could give credence to the panspermia hypothesis would be the presence of carbon-based molecules on meteors that strike the earth's surface.
<h3>Evidence of extraterrestrial lives</h3>
All biomolecules of life are carbon-based. Examples of these molecules include carbohydrates, proteins, ribonucleic acids, etc.
In order for life to exist in a place, carbon must be abundant.
Thus, the presence of carbon-based molecules on meteors from another planet that hit the surface of the earth may be evidence that life exists on another planet.
This can be used as evidence that life on earth came from extraterrestrial sources.
More on panspermia can be found here: brainly.com/question/11624205
Answer:
B
Explanation:
Pheromones a chemical substance produced and released into the environment by an animal, especially a mammal or an insect, affecting the behaviour or physiology of others of its species.
Answer:
This study was focused on an Ecosystem level, as it involved soil properties and above-ground vegetation interacting with mentioned soil physic properties.
Explanation:
Ecological studies can be performed at different hierarchy levels:
- <u>Organism</u>: This is an individual physiologically independent from other individuals. At this level, it must be understood <em>how an organism survives</em> under certain changing <em>physic and chemistry conditions</em>, and how it <em>behaves</em> to reproduce, avoid predators, and find food.
- <u>Population</u>: Groups of individuals from the same species, with similar characteristics, capable of crossing, leaving offspring that live in the same habitat at the same time. At this level, it is interesting to know the <em>size of the population required to leave fertile offspring</em> that ensure the population will <em>survive over time</em>. It is also interesting to know <em>genetic variability </em>that allows <em>evolutive adaptation </em>to environmental changes.
- <u>Community</u>: Relationship or interaction between different species groups that live in the same habitat and at the same time. At this level, it is interesting to study <em>inter-specific interactions</em> that could cause <em>changes in the populations´ size</em>. These could be the cases of competition, predation, parasitism, mutualism, and etcetera.
- <u>Ecosystem</u>: Basic interaction unit between population and environment that turn in complex relations existing between living and non-living elements in a given area. In the example, interactions between recovering vegetation and soil properties, as non-living elements.
Answer:
Actin filament are one subunit type.
Intermediate filament has many subunit types.
Microtubules has two subunit types.
Intermediate filament has diverse cellular role.
Explanation:
Actin filament is a monomeric subunit of two types of filament in cells. The two types of filaments are the microfilaments which is one of the three components of the cytoskeleton and the thin filament which is a part of the contractile apparatus in muscle cells. Actin filaments are made up of identical actin protein arranged in a long spiral chain. Actin filaments play a major role in cytokinesis and in cell movement.
Intermediate filament have a strong and rope-like structure. Intermediate filaments are composed of various proteins, depending on the type of cells they are found. The play a significant role by working in tandem with microtubules to provide strength and support do flagile tubule structures.
Microtubules contains two polypeptide subunits in which the dimers of this subunits string together to form long strands called the protofilament. They are long and cylindrical in structure. They perform a variety of functions which include the determination of cell shape, involvement in cell movement and in the position of organelles in cells.
