The causative agent of bubonic and pneumonic plague isa. yersinia pestisb. toxoplasma gondiic. borrelia burgdorgerid. clostridium perfringense. francisella tularenis

A. Yersinia Pestis

Explanation:

Yersinia Pestis is a bacterium which is anaerobic and can infect humans.

The Bubonic plague is caused by a bacterium (Yersinia Pestis). After coming into contact with the bacterium, symptoms begin to present themselves within one to seven days. These symptoms are typically flu-like (fevers, headaches and vomiting). In addition, swelling might occur at the lymph nodes closest to the area where the bacteria entered the skin.

The Pneumonic plague is also caused by the Yersinia Pestis bacterium and presents itself as a severe lung infection. Similar to the Bubonic plague, the symptoms can take between one and seven days to start showing (fevers, headaches, coughing, shortness of breath).

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.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.