When to neuter. A male dog can be neutered any time after eight weeks of age. A few years ago, most veterinarians advised waiting until puberty hit at about six months, and some still make that recommendation. Talk to your veterinarian about whatâs best for your dog.
The phylum Cycadophyta contains about 140 living species of plants called cycads, with more species present in the fossil record. Cycads have seeds and water-conducting vessels. Cycads belong to a larger group of plants called gymnosperms, which bear seeds in cone-like structures.
Authorities differ in what they consider a phylum, and in the actual name of the phylum. Despite this, there is agreement on most phyla. Most modern surveys include groups above the phylum: superphyletic groupings based on evidence of common descent. Chordata: the phylum which contains the vertebrates. 2  As with the Arthropoda, some taxonomists regard this as a Superphylum, with three phyla. 3  Here, the chordata has three sub-phyla: 4  Urochordata: the tunicates.