The body temperature of a mammal has to be maintained at a fairly constant level because
excessive heat is continually lost by the body to the environment
their body temperature is always higher than that of the environment
evaporation of sweat cools the body
metabolic activities function best at certain temperature
Correct answer is D
No explanation has been provided for this answer.
Green plants lose water to the atmosphere through the process of
respiration
photosynthesis
transpiration
translocation
Correct answer is C
No explanation has been provided for this answer.
The products of respiration are
nitrogen and water
nitrogen and carbon dioxide
water and oxygen
carbon dioxide and water
Correct answer is D
No explanation has been provided for this answer.
The hepatic portal vein is often heavily loaded with food-nutrients because it carries blood
directly from the heart
from the liver to the heart
from the small intestine to the liver
from the liver to join the posterior vena cava
Correct answer is C
No explanation has been provided for this answer.
Excessive bleeding from an injury may be due to lack of vitamin
A
B
C
K
Correct answer is D
No explanation has been provided for this answer.