Que tedria de particular la retina de un animal que no pudiera diferenciar los colores cuya vision fuera exclusivamente en blanco y negro

La falta de células cono en la retina

Explanation:

En vertebrados, la retina se encuentra formada por dos tipos básicos de células denominados células conos y células bastones. Las células cono son unas células fotosensibles las cuales forman una capa concentrada en el centro de la retina. Estas células (células cono) son responsables de la distinción entre diferentes colores del espectro de luz visible. Las células cono se clasifican en tres tipos de acuerdo a su sensibilidad para distinguir la luz azul, roja, y verde. Esta sensibilidad se debe a la presencia de diferentes tipos de proteínas opsinas, las cuales confieren la capacidad de absorber la luz en una longitud de onda particular: cianopsina (sensible a la luz azul), eritropsina (sensible a la luz roja) y cloropsina (sensible a la luz verde). Animales como los gatos y los perros son daltónicos, es decir, no pueden completamente diferenciar los colores, debido a la falta de una o más clases de células cono (y por lo tanto también de opsinas) en la retina.

relationships aren't everything. people everyday spend there entire life depending on reltionships and for someone to be there for them when this is absurd. why must people depend on someone else to bring them happiness? i'm not saying it wrong to feel happy with someone, but people feel that they need to be in a relationship in order to feel happy, when, this is not true. you can paint, write, read ir slend tume with family ir even spend time working in yourself. this can be an exciting experience to find yourself. it's bot wrong to be in a relationship but if you let it be your only source of happiness, than you will never find true happiness.

so, relationships are not always worth it. if you are so dependent on them, than in the end they arent worth it because you will realize how unhappy you really were. some people even tend to cut ties with family because they think they cabt make them happy, obly realtionships with a lover can. false. in order to find true happiness, one must learn to love themselves if they want to love someone else. it's unhealthy to be always depend on relationships and to alqays be in and out of one.

so live life, get that job you always wanted, buy those new shoes and love yourself. depend on yourself, not others. they arent worth it, you can make yourself more happier than most people can do to you. it's not woth it. take your time and have fun.

a axis of a graph is a color or shade so we can all go outside and have a party so we can eat   some grilled cheese sammiches and broccoli and have some ugly fun times

i don't know why i put this, i know its not the i was just bored : p

delete this answer while you can