HELLO DON'T FORGET TO LIKE
the girth of a stem increases due to intercalary meristem ...
hope it helps
due to the lateral meristematic tissue..
Due to the presence of meristematic tissue in the stem of plant. that is responsible for the increase in width of the stem
the size of stem increase in width due to stem
summer due to presence of aixin
animals are multicellular eukaryotic organisms that form the biological kingdom animalia. with few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development. over 1.5 million living animal species have been described—of around 1 million are insects—but it has been estimated there are over 7 million animal species in total. animals range in length from 8.5 millionths of a metre to 33.6 metres (110 ft). have complex interactions with each other and their environments, forming intricate food webs. the kingdom animalia includes humans, but in colloquial use the term animal often refers only to non-human animals. the study of non-human animals is known as zoology.
temporal range: cryogenian – present, 665–0ma
major animal taxa
most living animal species are in the bilateria, a clade whose members have a bilaterally symmetric body plan. the bilateria include the protostomes—in many groups of invertebrates are found, such as nematodes, arthropods, and molluscs—and the deuterostomes, containing both the as well as the chordates, the latter containing the vertebrates. life forms interpreted as early animals were present in the ediacaran biota of the late precambrian. many modern animal phyla became clearly established in the fossil record as marine species during the cambrian explosion, began around 542 million years ago. 6,331 groups of genes common to all living animals have been identified; these may have arisen from a single common ancestor that lived 650 million years ago.
, aristotle divided animals into those with blood and those without. carl linnaeus created the first biological classification for animals in 1758 with systema naturae, jean-baptiste lamarck expanded into 14 phyla by 1809. in 1874, ernst haeckel divided the animal kingdom into the multicellular metazoa (now synonymous with animalia) and the protozoa, single-celled organisms no longer considered animals. in modern times, the biological classification of animals relies on advanced techniques, such as molecular phylogenetics, are effective at demonstrating the evolutionary between animal taxa.
humans make use of many other animal species for food, including meat, milk, and eggs; for materials, such as leather and wool; as pets; and as working animals for power and transport. dogs have been used in hunting, many terrestrial and aquatic animals are hunted for sport. non-human animals have appeared in art from the earliest times and are featured in mythology and religion.
in human culture
the number and kinds of organisms is never constant. populations are constantly affected by various factors. these factors include:1. season: some organisms, plants and animals alike, are present in the ecosystem only during certain time. for example mayfly, mayflies spend a year awaiting their birth, and then most die after living just one day.2. extinction: some species might be wiped out due to human or environmental activities.3. human activities: deforestation causes a loss of a great number of organisms, hunting reduces the number of