Im giving brainliest :D Which of the following best describes how the boy is able to flex his muscles?

As the boy bends his arm, the triceps muscles contract and extend.

As the boy bends his forearm, the biceps muscles contract and bunch up.

As the boy flexes his arm muscles, both the biceps and triceps muscles contract at the same time.

As the boy moves his forearm, both the biceps and triceps muscles relax at the same time.

The environments condition has an affect on the inhabitants true or false

The high temperature in rockport over the weekend was 55(1/4) °f. write this temperature value as a decimal number with two decimal places. the decimal form of °f is

Which of the following best reflects what we know about how the flu virus moves between species? a) the flu virus in a pig is mutated and replicated in alternate arrangements so that humans who eat the pig products can be infected.b) a flu virus from a human epidemic or pandemic infects birds; the birds replicate the virus differently and then pass it back to humans.c) an influenza virus gains new sequences of dna from another virus, such as a herpesvirus; this enables it to be transmitted to a human host.d) an animal such as a pig is infected with more than one virus, genetic recombination occurs, the new virus mutates, the virus is passed to a new species such as a bird, and the virus mutates again and can now be transmitted to humans.