At times, unfavorable environmental conditions can cause one gender of a certain population of organisms to drastically decline. during such times, the other gender makes up for the decline by reproducing on its own. this type of reproduction is called the first vertebrate organism to have successfully produced offspring in this manner is the

1a. broadcast spawning
b. parthenogenesis
c. pollination

2a. elephant
b. guppy
c. sawfish

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation:

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.