Biology College

Reviewing Key Concepts: Major Evolutionary Milestones

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Answer 1

Answer:

Porifera Sponges - Multicellular

Cnidaria Jellies- True tissues

Platyhelminthes Flatworms

Bilateral symmetry, Cephalization, Triploblastic

Nematoda Round Worms - Body Cavity

Mollusca Mollusks - Body Cavity, Nervous systems, Messenteries

Annelida True Worms - Segmentation, Specialization of gut areas

Arthropoda Buggity Bugs - Jointed appendages, Highly developed cephalization

Echinodermata Sea(stars, urchins, cucumbers) -Deuterostome development

Chordata and Subphylum Vertebrata - Internal skeletal support

Agnatha - Endoskeleton, Cranium

Chondrichthyes - Jaws, Paired fins

Osteichthyes - Calcified bones, Lateral lines

Amphibia - Supportive limbs, Double loop circulation, Lungs, Tympanum

Reptilia - Amniotic egg, Watertight skin, Alveoli, Heart with ventricular septum

Aves - Endothermy, Feathers, Hard shelled egg, Flight adaptations

Mammalia -Mammary glands, Highly developed brains

Explanation:

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Answer 2

Major Evolutionary Milestones are:

4.6 Billions years ago (BYA) - origin of Earth3.5 BYA= first life exist2.1 BYA= Eukaryotes exist1.2 BYA= Multicellular life occurs0.6 BYA= first animals occur0.5 BYA= Life move on land0.02BYA= Human beings occur

It is generally accepted that the Major Evolutionary Milestones of contemporary humans from our archaic ancestor involves four main stages:

Developing territorialityBipedalismA huge brain (encephalization)Civilization.

These are the Hadean (4.6–4 billion years ago), Archean (2.5–4 billion years ago), Proterozoic (2.5–541 million years ago), and Phanerozoic (4.4–4.6 billion years ago) (541 million years ago to the present).

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Reviewing Key Concepts: Major Evolutionary Milestones

Related Questions

how are mutation and sexual reproduction involved in creating and maintaining variation in a population

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Answer:

Mutation and sexual reproduction are two essential processes that contribute to creating and maintaining variation in a population.

Mutation is the ultimate source of genetic variation in a population. It is a random process that generates new alleles or genetic variations in an organism's DNA. Mutations can arise due to various factors such as exposure to radiation, chemicals, or errors during DNA replication. These mutations can be beneficial, harmful, or neutral, and they can change the physical traits of an individual.

Sexual reproduction involves the fusion of gametes from two parents to produce offspring that inherit traits from both parents. The process involves the mixing and recombination of genetic information from each parent, resulting in a unique combination of genes in the offspring. Sexual reproduction can introduce new genetic variations into the population and shuffle existing genetic variations, resulting in an increase in genetic diversity.

Both mutation and sexual reproduction work together to create and maintain genetic variation in a population. Mutations provide the raw material for genetic variation, while sexual reproduction shuffles and recombines this variation. The combination of these two processes leads to the creation of unique genetic combinations, which can help populations adapt to changing environmental conditions and evolve over time.

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