Explain how body plan and anatomy enables invertebrate to perform the essential functions it needs to survive.

Invertebrates are organisms that do not have backbones, however, many of them have special internal or external skeletons that are made of various materials and can fit their functions depending on the environment of the organism. Some animals have crystalline structures, others have cuticles, an outer covering for arhthropods, others have internal structures that contain high internal pressures, among others. 

These designs are all specific for adapting to the changes within their environment and the way that they gather and hunt for their prey.

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite   shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.

C. a mature ovule of a plant.