A plant that is too short may not be able to compete with other plants for sunlight. However, extremely tall plants may be very susceptible to wind damage. Combined, these two selection pressures are an example of which type of selection

The owner of firewood to go is considering buying a hydraulic wood splitter which sells for $50,000. he figures it will cost an additional $100 per cord to purchase and split wood with this machine, while he can sell each cord of split wood for $125. if, for this machine, design capacity is 50 cords per day, effective capacity is 40 cords per day, and actual output is expected to be 32 cords per day, what would be its efficiency?