Explain how machines can be useful if the output force i always less than the input force

In general, are there any major differences that you can see? explain

What part of the cell does 9 represent? a. cytoplasm b. lysosome c. ribosome d. centrosome

Which one is an advantage of external fertilization a. the offspring are genetically identical to the parents b. more eggs can be fertilzed at one time c. more sperm can be released at one time d. more protection is available for developing plz