Three sources of genetic variation are mutation, recombination and gene flow.
Genetic variation is the differences in the genetic makeup of individuals within a population.
The sources of genetic variation are;
Mutation: Mutations are random changes that occur in an organism's DNA sequence.
Recombination: Recombination occurs during meiosis, the process by which gametes (e.g., sperm and egg cells) are formed.
Gene Flow: Gene flow refers to the movement of genes between populations. This occurs when individuals from different populations interbreed and exchange genetic material.
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Answer:
A
Explanation:
Surface mining destroys vegetation and affects soil strata. Mining disrupts to topsoil microorganisms. Reclamation operations that dilute topsoil with subsoils can degrade soil.
Surface mining is a type of mining in which the soil and rock covering the mineral deposits are removed. It's the other way to mine underground. The rock on top is left in place, and the needed minerals are taken out through shafts or tunnels.
Surface mining can hurt fish and aquatic resources by causing erosion and sedimentation, drying up wetlands, rerouting and channelizing streams, and putting toxic chemicals into the surface water and aquifers.
This will further disrupt plant life on surface.
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Answer:
Surface mining destroys all plant life in the area the mine occupies. Plants living in the area where the surface mine is to be located are removed. ... All three types of mines cause some damage to the environment.
Explanation:
IF THIS HELPS MARK AS BRAINLIST
Answer:
The outer layer of a cell that acts as a gatekeeper to a cell is the Cell Membrane or Plasma Membrane.
The cell membrane made up of mostly phospholipids and proteins and is known as selectively permeable membrane as it allows the entry of some selective molecules into it.
The plasma membrane is the layer present between the cell and its external environment. As the gatekeeper takes care of entry, cell membrane also regulates the molecules that enters and exits the cell from external environment.
Cells membrane helps in maintaining appropriate amount of molecules to function inside them.
Hence, the correct option is Cell Membrane.
B) DNA 0> transfer RNA 0> messenger RNA 0> protein
C) DNA 0> transfer RNA 0> protein 0> messenger RNA
D) Protein 0> messenger RNA 0> transfer RNA 0> DNA
Answer:
D. The energy flow is not dependent on any members of the ecosystem
Explanation:
The energy flow in an ecosystem is not dependent on any member of the ecosystem. It is the flow of energy through the food chain, energy is passed from members in one trophic level to members in another or the next trophic level. The flow of energy in an ecosystem is important because it helps in maintaining balance in ecology.