Extensive irrigation in arid regions causes salts to accumulate in the soil. (When water evaporates, salts are left behind to concentrate in the soil.) Based on what you learned about water balance in plant cells, why might increased soil salinity (saltiness) be harmful to crops?

Which could be a pathway of food through an ecosystem

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

Fossils of ancestors of the modern horses show a small 4-toed almost dog-like browsing animal named eohippus over time the horses got larger lost toes and changed to a grazing diet what is the best explanation of why this change occurred