A rise in oxygen in Earth's air and seas put organisms that engaged in _____ at a selective advantage

a. fermentation
b. photosynthesis
c. sexual reproduction
d. aerobic respiration
e. anaerobic respiration


d

Biology & Microbiology

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Which of the following statements about El Niño are true?  

_____  Occurrence of El Niño is irregular and unpredictable. _____  The immediate effect of El Niño is a weakening in the east-to-west trade winds _____  Weakening in the trade winds results in more upwelling along the Peru-Ecuador coast. _____  El Niño results in the movement of weather systems from the western Pacific eastward. _____  El Niño events in the Pacific can influence weather as far away as Africa.

Biology & Microbiology

Suppose you have a way to measure the amount of DNA in one cell during the cell cycle. You first measure the amount at the G1 phase. At what points in the rest of the cycle will you see a change in the amount of DNA per cell?

What will be an ideal response?

Biology & Microbiology

The part of a flowering plant that becomes the fruit is the ________

a. ovule b. embryo sporophyte c. zygote d. ovary

Biology & Microbiology

Chemical defenses that some plant species employ to deter germination and growth of other plants are examples of:

a. exploitative competition b. interference competition c. competitive exclusion d. character displacement e. resource partitioning

Biology & Microbiology