1) Evidence from comparative anatomy Homologous structures can be used to explain the evidence...
Month: February 2023
A) Mutation theory of organic evolution Mutation is a change in genetic material resulting...
Charles Darwin, a British biologist, in 1859 propounded a theory of organic evolution by...
Jean Baptiste Lamarck, a French biologist was one of the first biologists to put...
The world is occupied by millions of different kinds of plants and animals. These...
The lower plants All the plants from the single-celled Chlamydomonas, bacterium, Phacus to the...
Physical Setting The coastal lowlands bordering of Nigeria range in height from sea level...
Physical Setting The western highlands region covers Oyo, Osun, Ondo, Ekiti, Edo and parts...
Physical Setting The Cross River plains lie between the Udi hills to the west...
Physical Features The Niger-Benue trough is a massive depression in the middle of the...
Physical Features The Chad Basin in the north eastern extreme corner of Nigeria is...
Physical Features The Sokoto plain in northwest Nigeria is essentially a dissected lowland, about...
This region is found east of the Niger delta and south of River Benue....
Physical Setting The eastern highlands consist of chains of hills, plateaus and mountains along...
Nigeria can be classified into nine broad geographical regions, each having obvious and essentially...
Physical Features This is a very extensive region that extends from Katsina in the...
The part of plasma which filters into the spaces among the tissues and flows...
There are three plans or types of blood circulation in human beings, other mammals...
The heart is an muscular organ that pumps blood to all human parts of...
The main physical features are the geology, relief and drainage systems. They are examined...
Nigeria is blessed with abundant mineral resources; and they are found all over the...
The transport system carries food and oxygen to all tissues and removes waste materials...
The group – Pteridophyta consists of ferns and club-mosses. Dryopteris is a fern. It...
Mosses are small, green and simple land plants belonging to phylum Bryophyta and class...
Seeds A seed is a structure which develops from the ovule after fertilization. A...
After the maturation of fruits, an abscission layer is formed at the point of...
Swimming movements Each side of the vertebral column (flexible backbone) of a fish is...
The appendicular skeleton is made up of the limb girdles (pectoral and pelvic girdles)...
There are over 2,000,000 known different organisms in the world today and probably over...
The animal kingdom is divided into invertebrates (animals without backbones) and vertebrates (animals with...
The modern classification system based on physiology, biochemistry and embryology have revealed distinct similarities...
Cockroach is an omnivorous animal eating anything ranging from starchy and sweet things to...
Movements in Hydra 1) Swaying Sometimes Hydra comes to rest on rock or other...
Haemorrhage (bleeding) is the coming out of blood from the blood vessels which have...
Pollination is defined as the transfer of mature pollen grains from the anthers of...
Immediately after pollination, fertilization follows. Fertilization is the union of male and female gametes...
This is the part of the plant which grows above the soil except the...
The root system is the part of the plant growing in the soil. This...
The flowering plants form a group of plants known as Angiosperms. They are characterized...
Primates are the most highly developed of all mammals with large brain, forward-facing eyes...