Ascientist discovered a new antibiotic and wanted to know if it would be effective against group a streptococcus bacteria. he designed a test experiment in a lab with ten different cultures of the bacteria. he introduced the antibiotic into five of the cultures, leaving the other five to grow without it. he recorded observations every three hours for a week.

what is the independent variable in this experiment?
a.
the presence of the new antibiotic
b.
the presence of the streptococcus bacteria
c.
the total number of bacteria cultures
d.
the reaction of the bacteria to the antibiotic

Which table best shows the impacts resulting from human activity? impact of human activities human activity impact forest area cleared to construct an airport increase in oxygen level vegetation cleared to construct an oil mine increase in pollution impact of human activities human activity impact forest area cleared to construct an airport increase in sound pollution vegetation cleared to construct a power plant contamination of water impact of human activities human activity impact beehives cleared from urban areas increase in vegetation dams constructed on a river increase in fish population impact of human activities human activity impact beehives cleared from urban areas increase in bird population dams constructed on a river better quality of water

What is the role of the phospholipid belayer in cellular transport in living cells

Drag each description to the correct location on the image. not all descriptions will be used. describe the parts of a comet. the frozen part of the comet the atmosphere of gases and dust formed when the nucleus vaporizes tail made of small, solid dust particles tail made of ions that appears to point away from the comet's orbit