Choose the odd one with respect to sexuality.

$(a)$ In both plants and animals,there are three phases during their life cycle.
$(b)$ In plants and animals,hormones are responsible for the transitions between these three phases.

In which of the following is external fertilization observed?

$A$ bacterial cell divides every minute. It takes one hour to fill up a cup. How much time will it take to fill half the cup?

Select the incorrect sentence regarding post-fertilization events.

In this type of reproduction,the offspring are exact clones of their parents.