In order to study the effect of an antibiotic on bacterial growth you design an experiment in which you add varying concentrations of antibiotic to several groups of bacteria. You keep the exposure to light and the temperature constant among the various groups. What is an appropriate control?

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.

you know they are heterozygous for a trait because they have it as jj or jj.

i think its both a and b