1. The correct answer is option B, single-celled eukaryotes that sometimes grew in colonies
Reason – Single celled species are originally the main ancestors of all animals because after evolution and classification, these species evolved into multicellular organisms which later on further diversified into different generas, species and classes. Living in colonies allowed these single celled species to produce sexually
2. The correct answer is option B, representatives of most animal phyla
Reason – The cambarian explosion is considered as the most evolutionary phase in the Earth’s history. All major animal body plans including Ctenophora, Poriferas, Cindaria, Chordata, Hemichordata, Echinodermata, Nematoda, Artropoda, Platyhelminthes, Mollusca, Annelida, Brachiopoda etc. occurred during this period.
Answer:
The correct answer would be isotonic.
Isotonic solutions are the set of solutions which have the same concentrations of solutes.
They have same osmotic pressure across a semipermeable membrane.
The net movement of water is zero in such solutions.
Hence, the water solution that has the same salt concentration as the cells is said to be the isotonic solution.
The dependent variable in the experiment given above is THE HEART RATE.
In every experimental set up, there are usually two major type of variable, these are dependent and independent variables. Dependent variable refers to those variable that their values depend on the value of others while independent variable refers to those variable whose values do not depend on any other variable. In the question given above, the heart rate is the dependent variable because its value depend on the type of exercise that a participant undergo.
B)RNA ploymerase reaches a terminator region.
C)Nucleotides are covalently linked together.
D) RNA polymerase binds to a promoter region of DNA.
Answer:
Acellular Organism
The organisms without a cell structure are known as Non-cellular life or accelular life.