WILL MAKE BRANLIEST How have humans influenced the Antarctic tundra ecosystem?

Group of answer choices

Humans have adapted to live in colder areas and moved into the Antarctic tundra.

Humans have hunted several species that are only found in the Antarctic tundra.

Humans have increased the greenhouse gasses found in the atmosphere.

Humans have moved into the area and cleared out several plants and trees.

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.