Question

please help!

1.Which of the following organisms exhibits radial symmetry?

Flatworm

Butterfly

Tadpole

Starfish

2.Which type of plant tissue is involved in physiological processes like photosynthesis, storage, and support?

Ground tissue

Dermal tissue

Vascular tissue

Meristematic tissue

3.Why might it be more useful to classify Bacteria and Archaea based on their morphology rather than solely on their phylogeny?

Both domains are capable of sharing segments of DNA with unrelated organisms which makes genetic classification difficult.

Cla

Answer 1

Heya, please don't just post your direct homework questions.

Anyway radial symmetry is symmetry around a central axis. That is, you can make more than one "cut" through the centre and there will be symmetry along each cut (urgh, bad explanation but think of cutting a pie and how each side will be the same).

Try this website for your second question: http://www.phschool.com/science/biology_place/biocoach/plants/tissue.html

Answer 2

In radial symmetry the organism exhibits a circular arrangement with numerous planes that create identical parts. Radial symmetry is analogous to a pie in which the organism may be cut in several planes with each part (piece of pie) being identical. A organism with radial symmetry exhibits no left or right sides. It has a top (oral surface) and a bottom (aboral surface). Animals in the phyla cnidaria and echninodermata exhibit radial symmetry.

In bilateral symmetry a organism can be divided in only one plane producing two mirror image halves. (Note that we are only referring to the external surface when discussing symmetry.) This division produces a left and right side. It is found in animals with cephalization (concentration of sensory organs in the head). These animals move in the direction of their head.

http://web.archive.org/web/20080130021835/http://www.personal.psu.edu/faculty/w/x/wxm15/Online/Zoology%20Unit/zoology_links.htm#Symmerty

Answer 3

Archaea were first classified as a separate group of prokaryotes in 1977 by Carl Woese and George E. Fox in phylogenetic trees based on the sequences of ribosomal RNA (rRNA) genes.[4] These two groups were originally named the Archaebacteria and Eubacteria and treated as kingdoms or subkingdoms, which Woese and Fox termed Urkingdoms. Woese argued that this group of prokaryotes is a fundamentally different sort of life. To emphasize this difference, these two domains were later renamed Archaea and Bacteria.[5] The word archaea comes from the Ancient Greek ἀρχαῖα, meaning "ancient things".[6]

At first, only the methanogens were placed in this new domain, and the archaea were seen as extremophiles that exist only in habitats such as hot springs and salt lakes. By the end of the 20th century, microbiologists realized that archaea is a large and diverse group of organisms that are widely distributed in nature and are common in much less extreme habitats, such as soils and oceans.[7] This new appreciation of the importance and ubiquity of archaea came from using the polymerase chain reaction to detect prokaryotes in samples of water or soil from their nucleic acids alone. This allows the detection and identification of organisms that have not been cultured in the laboratory.[8][9
http://en.wikipedia.org/wiki/Archaea

Answer 4

O_O This was One year ago.... How did you find this?

Answer 5

Lml idk, i think i googled one of those questions