Mammalian eyes sense light because the photoreceptor cells have molecules called opsins, which change structure when exposed to light. which of the following plant molecules would be analogous to mammalian opsins in their light-sensing ability?
a. pfr and phytochrome
b. cytokinins and phototropins
c. auxin and pfr
d. auxin and phytochrome

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. the following chemical equation shows the combustion of ethane. balance the equation by filling in the coefficients. c2h6 + o2 → co2 + h2o

What is the inability of an individual or a society to achieve a minimum standard of living known as ?

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.