A continuación, se presentan distintas sustancias puras, ¿Cuáles corresponden a elementos? * Ozono (O3) Metano (CH4) Agua (H2O) Hidrógeno (H)

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome

What is the process by which biological parents pass traits such as hair type or eye color to their children