Helllp me urgent Question 20 of 20
Which of these is a biotic factor in an aquatic ecosystem?
A. Dissolved oxygen
B. Seaweed
C. Water
D. Temperature change

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed

Prior knowledge can be gained from personal experience and a) forming well-developed hypotheses. b) listening to opinions of other people on a topic. c) researching previous experiments and results on a topic. eliminate d) no other methods. it can only be gained by personal experience.