Physical traits acquired after birth could be given to offspring
Explanation:
Lamarck proposed the theory of inheritance of acquired characters to explain the process of evolution. He explained that the organisms develop new traits during the lifetime by modification of existing body parts. These new traits are developed due to the "need" posed by surrounding conditions. The acquired traits are inherited to the next generation.
For example, the evolution of long-necked giraffe species occurred when the short-necked giraffes stretched their necks to reach the leaves of the tall trees to feed on them. The acquired trait "long neck" was passed to the future generations leading to evolution of giraffe population with long neck.
Tall land plants need lots of xylem and phloem, along with more energy. They need to be able to stand upright and have their leaves positioned in the sunlight. Aquatic plants do not need roots.
Because there will be no bias if the reasearcher knows which drug is being given and the subject wont know what they are being given so both may assume that the subject is going to feel happier and expect to have an elevated mood and relieve feelings of depression. Hope this helps :)