# Which of the phyla have only two germ layers?

## Which of the phyla have only two germ layers?

Diploblastic animals only have two germ layers: the inner endoderm and the outer ectoderm. Animals in the phyla Cnidaria and Ctenophora are diploblastic.

## Which animal group has only two layers?

Cnidarians

**What phylum has no germ layers?**

animals

A | B |
---|---|

mesodermal tissue is absent in | cnidarians |

first phylum with three germ layers was | platyhelminthes |

animals that are hermaphroditic | usually cross-fertilize |

an organism that possesses a scolex and proglottids lacks | a coelom |

### What are the two groups of animals with true tissues?

2) sponges are basal animals 3) eumetazoa is a clade of animals ( eumetazoans) with true tissues. 4) most animal phyla belong to the clase bilateria, and are called bilaterians. 5) chordates and some other phyla belong to the clade deueterostoma.

### What is considered true tissue?

True Tissue Instead, sponges have what is called cellular-level organization. The phylum Cnidaria contains what are considered the first eumetazoans, meaning that they possess true tissues. A tissue is a group of similarly structured cells that all work together to carry out a particular function.

**What is the only group of animals to lack tissues?**

Of all the branches of complex animals, sponges are the only group lacking TRUE TISSUE.

#### What is no true tissue?

Phylum Porifera: Sponges Sponges are the simplest of the multicellular animals. They are the only animals that do not exhibit obvious symmetry in their body organization. They have aggregations of different cell types but do not have true tissues.

#### Do jellyfish have true tissues?

The cnidarians, or the jellyfish and their kin, are the simplest animal group that displays true tissues, although they possess only two tissue layers.

**What is the most symmetrical number?**

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 202, … (sequence A002113 in the OEIS). Palindromic numbers receive most attention in the realm of recreational mathematics….Other bases.

70 | = | 1 |
---|---|---|

71 | = | 7 |

73 | = | 111 |

74 | = | 777 |

76 | = | 12321 |

## Is 3 a symmetrical number?

0, 3, 8 are the numbers which have lines of symmetry. Symmetry is the property of shapes which when flipped looks identical to it’s original shape. A line of symmetry is a line that divides the given shape into identical parts. 3 have one line of symmetry. Remaining numbers do not have any lines of symmetry.

## Which letter has only one line of symmetry?

letter N

**What has two lines of symmetry but no right angles?**

A parallelogram has no lines of symmetry. It has rotational symmetry of order two.

### What is a symmetrical line?

A line of symmetry is a line that cuts a shape exactly in half. This means that if you were to fold the shape along the line, both halves would match exactly. A square has 4 lines of symmetry, as shown below. An equilateral triangle has 3 lines of symmetry.

### What kinds of polygons are symmetrical?

Regular Polygons

An Equilateral Triangle (3 sides) has 3 Lines of Symmetry | |
---|---|

A Square (4 sides) has 4 Lines of Symmetry | |

A Regular Pentagon (5 sides) has 5 Lines of Symmetry | |

A Regular Hexagon (6 sides) has 6 Lines of Symmetry | |

A Regular Heptagon (7 sides) has 7 Lines of Symmetry |

**Is the only quadrilateral with two lines of symmetry a rectangle?**

The rectangle has only two, as it can be folded in half horizontally or vertically: students should be encouraged to try to fold the rectangle in half diagonally to see why this does not work. The trapezoid has only a vertical line of symmetry. The lines of symmetry indicated are the only ones for the figures.

#### What quadrilateral has 2 lines of symmetry and both are angle bisectors?

rhombus