Which of the following would prevent the spread of aids?
a. using condoms
b. avoiding high-risk behaviors
c. knowing your partner's sexual history
d. all of the answers are correct.

The correct answer is D. All of the answers are correct

Explanation:

AIDS or Acquired Immune Deficiency Syndrome is a syndrome or condition related to HIV that is transmitted through sexual contact, through contaminated needles, blood transfusion, among others. Both AIDS and HIV are difficult to treat and therefore prevention is necessary, this includes using condoms as fluids and genital ulcers are the main way AIDS spread, also, it is necessary to avoid high-risk behavior such as having unprotected sex, sharing needles or having multiple sexual partners and knowing whether you or your sexual partner's had acquired AIDS as well as knowing your partner's sexual history as in this way you can know whether she/he is likely to have AIDS. According to this, all of the options would help in the prevention of AIDS.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.