A starfish common the Mediterranean Sea are a problem because they tangle fishing nets and eat shellfish, such as oysters. Frustrated fisherman would pick starfish out of their nets and cut them into little pieces. Unfortunately, this only helped the starfish reproduce and make more starfish. Which answer below BEST explains how the starfish forms new pieces? a
Sexual reproduction by budding because each piece cut will form a new starfish.
b
Sexual reproduction by binary fission because each piece cut will form a new starfish.
c
Asexual sexual reproduction by budding because each piece cut will form a new starfish.
d
Asexual reproduction by fragmentation because each piece cut will form a new starfish.

b

Explanation:

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!