Explanation:
the most common gas in the atmosphere is nitrogen and oxygen followed by CO2 etc...
<span>LD
means lethal dose. LD50 is the amount of a material, administered at once to
cause the death of half (50%) of a group of test organisms. A test which shows that LD50 of a certain
chemical is 20 mg per kg means that 20 milligrams of that chemical for every 1
kilogram body weight of the test animal when administered in one dose, causes
the death of 50% of the test group.</span>
A healthy ecosystem can be described as Resilient (b)
A commonly cited broad definition states that a healthy ecosystem has three attributes:
1)productivity
2)resilience, and.
3)organization
The difference in water concentration across a selectively permeable membrane.
Answer:
C) traits cannot be chosen willfully, but are randomly inherited by our parents
