* Question 14

II Pause

Q Zoom

Question 14

Anita was using steel to make rusted sculptures. After building each sculpture, she caused the steel in the sculpture to rust by placing it into a tub filled

with salt water for eight hours. Anita wondered if steel would rust faster submerged in vinegar instead of salt water. To find out, Anita cut ten squares of

steel sheet metal and split them into two equal groups. She put one group of squares into a tub filled with salt water and the other group of squares

into a tub filled with vinegar. Once an hour for eight hours, Anita counted the number of rusted steel squares in each group.

What is the manipulated/independent variable in Anita's experiment?

A

number of rusted squares

B

time left in the liquid

ООО

С

the number of metal squares

D

the type of liquid the squares were placed in

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15 points come and ! in which environment is someone least likely to find fungi growing? a around the sides of a hot tub b on a log in a tropical forest c beneath a mat in a shower d under a rock in the desert

The diagram below represents a marine food web and a process that can harm the human population. each circle represents an organism and the smaller dots inside them represent a toxic substance. what is being represented and how does it harm the population? the diagram represents biological half-life, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents biomagnification, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents the process by which different organisms prey upon each other; this can impact the human population by reducing the number of organisms that do not contain the toxin. the diagram represents the way that toxins are metabolized by living organisms, with those at greater trophic levels able to metabolize more efficiently than those at lower levels. this means that those at higher tropic levels are safer for humans to consume compared to the organisms at lower trophic levels.

Name the following: (a) category of pathogen that causes diseases, like common cold and mumps. (b) the microorganism that requires a host to produce.