For a behavior to evolve under the influence of natural selection, that behavior must be a. directed by genes. b. neither adaptive nor harmful. c. acquired through learning. d. related to predator avoidance.

(a). directed by genes.

Explanation:

Natural selection can be defined as a process, by which organisms having favorable traits have more chance to survive and reproduce. Due to this, organisms with traits, which are adaptive for a given environment increase with each generation.

Organisms having favorable genes for a trait or behavior will have more chance to survive and pass these genes to next generations. Over time, natural selection will allow the organisms with favorable genes to adapt to their surrounding environment. Hence, for a behavior or trait to evolve under the influence of natural selection, the trait should be directed by genes.

Thus, the correct answer is option (a).

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.