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Questions in biology

[Homework Help] Table salt and water are examples of? A. atoms B. elements C. mixtures D. substances

[Homework Help] The plasma membrane is made up of: A. A double layer of cellulose B. A single layer of cellulose C. A double layer of protein D. A double layer of phospholipids

[Homework Help] During which phase do chromosomes first become visible?

[Homework Help] Describe evidence that supports the hypothesis that whales evolved from land-dwelling mammals.

[Homework Help] Lysosomes can be compared to the recycling and garbage centers of a city. How can this comparison be justified? A. They break down their own membranes and digest themselves. B. They repair worn out organelles. C. They break down and digest whole cells.

[Homework Help] Why are nutrients from fertilizer harmful to aquatic ecosystems? A. They cause an increase in fish populations. B. The increase in algae population reduces oxygen in the water. C. They can infect plants, which causes animals and humans to become sick. D. Fish and other organisms grow too large and can no longer live in the ecosystem.

[Homework Help] Which is most likely to happen to a population that becomes anatomically isolated from the rest of its species? A. The entire species will become extinct. B. The population will become a separate species over time. C. The population will breed with a different species nearby. D. The entire species will continue to have viable offspring together.

[Homework Help] Water molecules can pass into a cell, while larger molecules cannot. Which feature of a cell allows this to be true? A. Semipermeable membrane B. Photosynthetic chloroplasts C. Enzyme-carrying lysosomes

[Homework Help] Why do the cells in all living things need energy? A. to fuel their chemical reactions B. to help them decompose C. to communicate with other cells D. so they can block sunlight

[Homework Help] What stone-faced animal was all the rage in 1970?