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Questions in biology

[Done] Different types of skeletal systems have developed adaptive features suitable to an organism's way of life. With reference to the above statement: (i) State the types of skeletal system found in crabs and humans. (ii) Describe how the skeletal system of crabs and humans is suitable in the environment it lives in. (iii) State one disadvantage each of skeletal system found in crabs and humans.

[Done] Theodor Schwann's Animal Cell Theory (1839): - Investigate Schwann's extension of Schleiden's theory to animals. - Discuss how this unification of plant and animal cell theory advanced biological science.

[Done] Identify which type of natural selection is described in each case below: Results in the evolution of the species: Results in new species: Favors traits at the two extremes: No increase in diversity: One extreme trait is favored: Diversity decreases: Diversity increases:

[Done] The following steps describe how a pregnancy begins. Put the steps in the correct order. Step 1: Sperm cells enter the vagina. Step 2: Sperm cells swim through the female reproductive system to meet an egg. Step 3: The fertilised egg implants into the uterus lining. Step 4: The nucleus of the sperm cell fuses with the nucleus of the egg cell. Step 5: The fertilised egg travels along the oviduct to the uterus.

[Done] Answer the following questions. 1. What is the difference between pet and domestic animals? 2. What do you mean by herbivores, carnivores and omnivores? 3. What food should be given to dogs and cats? 4. Which are uninvited animals? Name some of them. 5. How are pests harmful to us? What can we do to get rid of pests? 6. Who is a veterinary doctor?

[Done] 1. Match the following. (a) It weaves its nest on branches of trees. (b) It has scratching feet to dig out insects from the ground. (c) It scoops food out of water. (d) It has a pecking or drilling beak. (e) It makes its nest with stones and pebbles. i. Pelican ii. Woodpecker iii. Penguin iv. Weaver bird v. Hen 2. Fill in the blanks. (a) The upward movement of a bird's wings when it is flying is called the ____________. (b) ____________ is when birds use their toes to hold firmly onto branches. (c) The duck has ____________ feet to help it swim in water. (d) Birds that fly have ____________ bones. (e) ____________ beak helps sparrows to crack seeds. 3. Answer in one word. (a) Feathers that help a bird fly (b) Feathers that help keep a bird warm (c) The downward movement of a bird's wings when it is flying (d) A bird that builds its nest on tall trees

[Done] Which model shows how genetic variation occurs as a result of the independent assortment of chromosomes? A. Non-sister chromatids AEC 00 M Chiasma 690 9 G B. Egg www Mother cell + کا Sperm Zygote

[Done] Which of the following must occur before mRNA can leave the nucleus in a eukaryotic cell? I. Introns are removed. II. Exons are spliced together. III. Exons are removed. IV. Introns are spliced together. V. A poly-A tail is added to the mRNA. VI. A 5' cap sequence is removed from the mRNA. A. III, IV, and V B. I, II, and VI C. III, IV, and VI D. I, II, and V

[Done] What are the effects of the interaction between an orchid and a tree? Orchids and trees have a commensal relationship. The orchids ______ while the tree ______.

[Done] Choose the term that has a prefix meaning many or much. Select one: A. Macrophage B. Biconcave C. Megakaryocyte D. Agglutinate E. Polycythemia vera