Why does a match not light in the bottom center of a bunsen burner

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data

Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.