Describe the following land biomes: desert, tropical rainforest, taiga, tundra, grassland, temperate deciduous forest, temperate rainforest

1.)Desert biome is the driest biome in the world, it only receives 10% of rainfall a year. Its plants and animals have to survive in an environment with little water and dramatic temperature changes from day to night.

2.)Tropical rainforest covers about ⅓ of the earth's land surface. They are dominates by trees and contains many different plants and animals. It takes in the carbon dioxide that we exhale and gives off the oxygen we breathe in, making them really important to our survival.

3.) Tundra is the treeless plain. Trees cannot survive in this biome because of the cold temperatures, high winds, and heavy snowfall, as well as the permafrost, a layer of permanently frozen soil.

4.) Grassland biome is filled with grasses, the length of the grass and the number of trees vary depending on the amount of rainfall.

4.) Temperate deciduous forest are the ones that periodically shed their leaves, grows in well watered parts of the temperate zone in which a long, warm growing season alternates with a cold winter. Precipitation, as either rain or snow tends to fall throughout the year.

transcription is a process in which information is rewritten. it is something our cells must do, in a more specialized and narrowly defined way. in biology, transcription is the process of copying out the dna sequence of a gene in the similar alphabet of rna. it needs to happen in the nucleus because that's where the dna is. dna is always inside the nucleus unless the cell is dividing.

transcription is the first step in gene expression, which involves copying a gene's dna sequence to make an rna molecule. transcription is performed by rna polymerases. it has three stages: initiation, elongation, and termination. rna molecules must be processed after transcription in eukaryotes.

explanation:

long version:

the protein synthesis consists two processes which are, transcription and translation. transcription takes place in the nucleus. it uses dna as a template to make an rna molecule. rna then leaves the nucleus and goes to a ribosome in the cytoplasm, where translation occurs. transcription is the first part of the central dogma of molecular biology: dna → rna. it is the transfer of genetic instructions in dna to messenger rna (mrna). during transcription, a strand of mrna is made that is complementary to a strand of dna.  

these three stages are:

  initiation: in which   is the beginning of transcription.occuring when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

    elongation: in which is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

    termination: in which is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".