The development of simple stone tools by early hominids led to the ability to procure meat more efficiently. this in turn led to the change in diet that included larger amounts of protein. many scholars believe that this shift in diet was a significant part of how our ancient ancestors adapted so quickly to a varied set of environments, and thus were able to begin cultural development. this demonstrates the intimate connection between:
a. evolution and technology b. nature and nurture
c. culture and environment d. biology and psychology

nature and nurture

Explanation:

According to my research on studies conducted by anthropologists, I can say that based on the information provided within the question this demonstrates the intimate connection between nature and nurture. This can be said because in the question it illustrates how the advanced ability to hunt animals (nature) was a main aspect of our change in diet and ability to adapt rapidly (nurture).

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i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.