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.
Submit. There are two divisions of seedless vascular plants. Phylum Lycophyta contains about 1,000 species usually less than two feet tall, including club mosses, spike mosses and quillworts.Most of the 11,000 species of Phylum Pterophyta live in the tropics and include ferns, whisk ferns and horsetails.They all reproduce by spores blown in the wind.hylum Lycophyta contains about 1,000 species usually less than two feet tall, including club mosses, spike mosses and quillworts. Most of the 11,000 species of Phylum Pterophyta live in the tropics and include ferns, whisk ferns and horsetails. They all reproduce by spores blown in the wind.