The organisms that produced the oxygen gas in earth's atmosphere in ancient times were

a. heterotrophic eukaryotes.
b. autotrophic eukaryotes.
c. autotrophic prokaryotes.
d. heterotrophic prokaryotes.
e. completely unlike modern organisms

Match the functions to the cell types ? contraction and relaxation. conducting electrochemical signals fighting diseases carrying genetic material

Iwill make you brainliest pleeze answer this fast i have to turn it in really soon brainliest promise easy question 6th grade ! a weather map shows a high pressure system with circles around it. what does this mean? a) an occluded front b) areas of equal altitude c) areas of equal pressure d) a stationary front

Which best describes this behavior? it is beneficial only to the males that do not fertilize eggs. it is beneficial only to the female workers that are not fertilized. it is beneficial to each one of the individual colony members. it is beneficial to the whole species, but not to all of the individual members.