True or False: Sequential hermaphroditic organisms can express both sexes at the same time.

Sequential hermaphroditism refers to organisms that have the ability to change their sex during their lifetime, either from male to female or female to male, but they do not possess the capability to express both male and female characteristics simultaneously. Typically, these organisms start as one sex and, depending on environmental factors, social dynamics, or reproductive needs, can transition to the other sex.

The essence of sequential hermaphroditism lies in this transition; at any given time, the organism is either functioning as a male or a female, not both. This adaptation allows the organism to maximize its reproductive success based on the demographics of their population or environmental conditions. Therefore, indicating that they can express both sexes at the same time would be a misunderstanding of how sequential hermaphroditism works.

Considering this, the correct response is that the statement is false.