nature of substratum
high salinity
high temperature
low pH
Correct answer is A
The most important abiotic factors that organisms have to adapt to are: low oxygen levels and a soft substratum.
A marine protozoan is likely to have no contractile vacuole mainly because the cytoplasm is
isotonic to sea water
hypotonic to sea water
hypertonic to sea water
impervious to sea water
Correct answer is A
No explanation has been provided for this answer.
The association between bacteria residing in the rumen of the ruminant is?
parasitism
predation
saprophytism
mutualism
Correct answer is D
Bacteria in the rumen of ruminants, in algae, and in fungi mostly exist within a mutual relationship.
The most important ecological factor in a terrestrial environment is?
rainfall
humidity
wind
soil
Correct answer is D
The land surface and the soil are the main factors.
In a bean seed, absorption of water at the beginning of germination is through the?
hilum
micropyle
testa
plumule
Correct answer is B
The micropyle helps to absorb water at the time of the seed's germination.