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08-Sep-2017 16:17

Known as the Ediacaran biota, these deposits date back 600 million years ago. Minute female cones are composed of 2-4 reduced scales, but usually only one scale bears an ovule that matures into a seed.

Some of these ancient protoctists may have been ancestral to certain animal and plant phyla. There is little resemblance to a cone in the mature seed.

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iving organisms are subdivided into 5 major kingdoms, including the Monera, the Protista (Protoctista), the Fungi, the Plantae, and the Animalia.

Some general biology textbook authors place the microscopic, unicellular green algae (Division Chlorophyta) in the Kingdom Protista, and place the larger, multicellular (macroscopic) green algae (Division Chlorophyta) in the Kingdom Plantae. The seeds are similar to the California nutmeg (Torreya californica) and Pacific yew (Taxus brevifolia), members of the closely-related Yew Family (Taxaceae).

They also place the macroscopic, multicellular brown algae (Division Phaeophyta) and red algae (Division Rhodophyta) in the Kingdom Plantae. In the latter species, the naked seed sits partially exposed in a red, cup-shaped aril.

Although the Kingdom Protista includes mostly unicellular organisms, the WAYNE'S WORD staff feels that these algal divisions belong in the Kingdom Protista (Protoctista) rather than the Kingdom Plantae.3. Another group of conifers with fleshy seed-bearing structures are the junipers (Juniperus) in the Cypress Family (Cupressaceae).Sections of the M-RNA strand called introns are removed, and the remaining portions called exons are spliced together to form a shortened (edited) strand of mature M-RNA that leaves the nucleus and travels to the ribosome for translation into protein.This process is known as "gene editing." Some authorities hypothesize that eukaryotic organisms may have evolved from ancient archaebacteria (archae = ancient) rather than from the common and cosmopolitan eubacteria.The archaebacteria could have flourished more than 3 billion years ago under conditions previously thought to be uninhabitable to all known life forms.

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Although many conservative references place the archaebacteria in a separate division within the kingdom Monera, most authorities now recognize them as a 6th kingdom--The kingdom Archaebacteria.

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