The first cells may have gained energy through a. redox reactions using diatomic oxygen (O2) as the final electron acceptor. b. ingesting algae present in the early oceans. c. light-driven ion pumps. d. the controlled oxidation of petroleum.

c. Through light-driven ion pumps

Explanation:

a. Through redox reactions using diatomic oxygen (O2) as the final electron acceptor❌

Oxygen was observed to be lacking on early Earth.

b. Through the controlled oxidation of petroleum❌

Petroleum is categorically a fossil fuel and couldn't be marked as being available or found on early Earth.

c. Through light-driven ion pumps✔✔✔

Light-energy that was derived from the sun was a ready and accessible source of energy that could have directed proton pumps in early or first cells.

d. Through ingesting algae present in the early oceans❌

Algae are known to be eukaryotes and was seen to have been established billions of years after the first cells developed.

c. light-driven ion pumps.

Explanation:

According to the records we know that the first cells took energy from the surrounding environment, and lived in the absence of O2, with the shortage of nutrients they began to obtain energy from sunlight and CO2 present in the atmosphere.

answer-

the statement that f(x) = |x+a| + b has exactly one x-intercept is sometimes correct.

solution-

it solely depends on b, whether the function will have one or two or zero x intercept.

this plot of the given function, f(x) = |x+a| + b will be the basic absolute value graph i.e v shape, with vertex translated to (-a, b), instead of origin.

1-   if b is zero, the graph will have exactly one x-intercept, at x= -a

2- if b is positive, the whole graph will be above the x-axis, hence it will have no x-intercepts.

3- if b is negative, the graph will be below the x-axis, hence it will have two x-intercepts.

∴ the statement is sometimes true.

the  different  of  these  two  are  that  they  differently  handle  their  team.

an  expressive  leader  focuses  on  the  task  at  hand  and  make  sures  that  their  goal  is  achieved.  they  accurately  finish  the  task.  an  instrumental  leader  on  the  other  hand  works  on  the  unity  of  the  group,  they  care  more  about  their  employees.  all  the  while  creating  a  good  environment.