Me ! i will give

a person with trisomy 21 has an extra copy of chromosome 21. what happened during meiosis that caused the person to get three, instead of two, copies of chromosome 21?

binary fission
crossing-over
genetic recombination
nondisjunction

What do heterotrophic cells need to survive?

Tara sees a commercial for a brand of pills that promise to boost energy and people perform better in work and school. as people in the commercial talk about how much better they feel when taking the pill, tara notices a message on the bottom of the screen that reads, "this pill is not approved by doctors and has not been tested in controlled experiments." what is the best conclusion that tara should make about the commercial? it is making scientific claims based on subjective observations. it is making scientific claims based on opinions instead of pseudoscientific facts. it is making pseudoscientific claims based on objective observations. it is making pseudoscientific claims based on opinions instead of scientific facts.

Which is an example of a decomposer? a. bear b. algae c. grass d. bacteria d bacteria